First epoch of the paleogene period
POPULARITY
2 episodes with Paleocene
8 episodes with Paleocene
2 episodes with Paleocene
2 episodes with Paleocene
Forte Minerals Corp (CSE:CUAU, OTCQB:FOMNF) CEO Patrick Elliott talked with Proactive's Stephen Gunnion about the company's significant strides in advancing its copper-gold portfolio in Peru. Speaking from Resourcing Tomorrow 2024, Elliott shared that the company has spent two decades assembling its world-class assets, focusing on drill-ready copper porphyry and high-grade gold projects in the Paleocene belt of southern Peru, a premier mining region. He emphasized Forte's upcoming plans, highlighting projects like Pucarini, set to commence drilling in March 2025, and Alto Ruri, a promising gold property near Barrick's Pierina mine. Both projects have potential for large-scale discoveries. Elliott noted that Forte's portfolio, built over years of strategic acquisitions and exploration, positions it well to meet growing copper market demands amid global supply deficits. Elliott also reflected on the heightened interest in Forte Minerals at the Resourcing Tomorrow conference, where industry players are showing renewed enthusiasm for high-quality copper assets. "It's the first time in a long time we've seen this level of interest, with companies conducting detailed evaluations of our projects," he said. Watch the full video to discover more about Forte Minerals' vision for 2025 and its plans for creating shareholder value. Visit Proactive's YouTube channel for more videos. Don't forget to like, subscribe, and enable notifications for future updates! #ForteMinerals #CopperGoldMining #PeruMining #MiningInvestments #PaleoceneBelt #CopperMarket #ExplorationProjects #GoldDiscoveries #ProactiveInvestors #ProactiveInvestors #invest #investing #investment #investor #stockmarket #stocks #stock #stockmarketnews
What if growing food was never meant to be about just the end product? What are we missing from conventional agriculture and gardening? Steven Martyn is an Ontario based teacher and practitioner of sacred agriculture and what he terms wildculturing. He focusses on the traditional living skills of growing food, building and healing and has a unique take on how we can live in the with the earth. Steven had me pondering how agriculture has been used to create culture historically, how we incorporate intentionality into horticulture, he even had me rethinking my morning beverage… About Steven Martyn Steven says “After passing from my body when I was 19 I saw what my life purpose was, and that I had fallen well short. I was given back my body to fulfill a very specific purpose in this life. Since that time forty some years ago I have spent my life spreading the green gospel and bringing people back to be healed by our Great Mother Earth. I spent many years teaching traditional plant use and many more de-programing colonial thinking, opening peoples minds and hearts to a sacred relationship with land, and specifically with the plant people. I practice and teach forms of sacred agriculture and “wildculturing” that our ancestors have practiced since the Paleocene, that generate such abundance the land easily feeds our family, school and friends.” Steven has more than thirty years experience living co-creatively with the Earth, practicing traditional living skills of growing food, building and healing. Steven created Livingstone & Greenbloom in 1986, Toronto's first green landscaping company. In 1996, he created the Algonquin Tea Company, North America's premiere bioregional tea company. He has given talks and run workshops internationally for more than twenty years and taught plant identification and wilderness skills at Algonquin college for 11 years, and at the Orphan Wisdom School for eight years. In 2014, Megan and Steven started the Sacred Gardener Earth Wisdom School. Steven released his first book The Story of the Madawaska Forest Garden in 2016, his second, Sacred Gardening in June 2017 and The Roundhouse in 2022. Steven Martyn: M.A. (traditional plant use), B.F.A. honours, artist, farmer, wildcrafter, builder, teacher, writer, visionary. Links Here are a couple of podcasts that Steven has been on: MYTHIC MASCULINE : Agents of Cultural Regeneration FOR THE WILD: Letting Land Lead www.sacredgardener.ca On instagram Other episodes if you liked this one: Regenerative Design - This episode, my guest is Erik Ohlsen, a US based regenerative designer, permaculturist, landscape contractor, author, farmer, herbalist, storyteller and practitioner of Nordic folk traditions. His approach to regenerative landscaping is rooted in decades of practical experience and a humbleness that allows Erik to be led by what the land has to tell him. The Human Garden - This episode is an interview with environmental landscape artist, TED Speaker and art21 Educator Tobacco Brown. Tobacco connects art and environmental justice and is a visual artist, digital storyteller, master gardener, social practitioner, cultural historian and intuitive environmental advocate. We talk about community green spaces, how humans connect with the land and why it's so important that we do. Please support the podcast on Patreon
In this the Paleocene giant animals roamed the earth. Kate Lyons and Alessandro Mereghetti are scholars studying the extermination of those creatures. Some people believe that a way to protect our climate may be to repopulate our arctic with wooly mammoths and other animals. We discuss this.
We all know the story of how the dinosaurs became extinct. But what happened afterward? Mike, Gavin, and Fia take a closer look at the post-extinction world of the Paleocene! Palaeocast Gaming Network video Gavin made about the new Pokemon Games: https://www.youtube.com/watch?v=lIgFW91jPXc Follow us on Twitter Topic form Guest Form Gavin's Blog Leave us an audio message Youtube Channel --- Send in a voice message: https://podcasters.spotify.com/pod/show/dead-podcast/message
LOOP 6.3: Documentary research takes you down a lot of unexpected avenues. If you're recreating something like the Chicxulub impact and the K-Pg mass extinction, then you need to be able to provide answers for things you didn't even know were questions. What colour was the asteroid? How bright was the flash? How long does it take to cook a Triceratops to death? Silverback Films researcher Edd Dyer returns to discuss the difficulties of finding such information. Life On Our Planet (LOOP) is a new 8-part series created for Netflix by Silverback Films and Amblin Television. This Steven Spielberg produced series, narrated by Morgan Freeman, is hugely ambitious in its scope, telling the story of life throughout the whole Phanerozoic Eon. Ancient organisms and environments are painstakingly recreated by the supremely talented Industrial Light and Magic, whilst modern natural history scenes add vital context to the story. This show has been worked on for six years, during which time countless papers were read and around 150 different palaeontologists contributed their time and knowledge. The whole production had culture of letting the scientific rese arch dictate scenes, resulting in one of the most accurate on-screen representations of prehistoric life there has ever been. And how do we know all this? Well, our very own team members Tom Fletcher and Dave Marshall have been embedded within the LOOP team since day one! We are therefore in a totally unique position to reveal to you the work that went into this series, from both the production and research side of things. In this unofficial series, we've been granted exclusive access to many of the people responsible for creating LOOP, we explore what it takes to create a palaeontological documentary and we delve deeper into the science with some of the show's academic advisors. Each day, we will be releasing batches of interviews, each relating to a specific episode of LOOP. Image courtesy and copyright of Netflix.
As the saying goes, history often repeats itself. Could that also hold true when looking at the current state of the climate and where we may be heading? On this episode, the team talks with Dr. Michael Mann, the director of the University of Pennsylvania Center for Science, Sustainability, and the Media and one of the world's leading experts on climate change. They discuss his new book, “Our Fragile Moment,” that examines Earth's climate history. Mann explains why the climate change we're currently experiencing is unique, why the next decade is so critical to our future climate, and what could happen to life on Earth if no action is taken. We want to hear from you! Have a question for the meteorologists? Call 609-272-7099 and leave a message. You might hear your question and get an answer on a future episode! You can also email questions or comments to podcasts@lee.net. About the Across the Sky podcast The weekly weather podcast is hosted on a rotation by the Lee Weather team: Matt Holiner of Lee Enterprises' Midwest group in Chicago, Kirsten Lang of the Tulsa World in Oklahoma, Joe Martucci of the Press of Atlantic City, N.J., and Sean Sublette of the Richmond Times-Dispatch in Virginia. Episode transcript Note: The following transcript was created by Headliner and may contain misspellings and other inaccuracies as it was generated automatically: Sean Sublette: Hello once again, everybody. I'm, meteorologist Sean Sublette, and welcome to Across the Sky, our national Lee Enterprises weather podcast. Lee Enterprises has print and digital operations in more than 70 locations across the country, including in my home base in Richmond, Virginia. I'm joined by my colleagues from across the sky, Matt Holiner in Chicago, and Joe Martucci at the Jersey Shore. Kirsten Lang is out this week. Our very special guest this week is Dr. Michael Mann, director of the University of Pennsylvania Center for Science, Sustainability, and the Media, and the Presidential Distinguished Professor of Earth and Environmental Science. His latest book came out a couple of weeks ago called Our Fragile Moment. It goes through Earth's climate history to illustrate how we know what the current warming climate is without precedent in Earth's history. There is so much good stuff in this book. I could go on and on, but I really like the way he goes into paleo climate and helping us understand why we are at this moment in time and why he calls it Our Fragile Moment. And as a quick aside, in the book, he kind of alludes to, the police, the band The Police, and the, extinction of the dinosaurs and walking in your footsteps. So those of us of a certain age who remember that a good part of, you know, sting was the lead man of the police, and, Fragile was another song that Sting wrote. So this all kind of ties back into me. Here I am showing my age. but, guys, this is such a great conversation. What did you kind of take out of this? Joe Martucci: I think, you know, and just take a step back. I mean, Mike Mann is, I would say, one of the people who really put climate science on the map to the general public. So this is really a big interview that we have here. And, when you're listening, sometimes we're getting into the weeds, sometimes it's big philosophical questions. In fact, at the end, we talk about his thoughts on where our position as the human race is in the universe just by writing this book. So, it was a nice interview, and good to be with, Mike here. Matt Holiner: Yes, there are few people that are a bigger expert on climate change than Mike Mann. And so, yeah, we're honored to have him on the podcast. And what I like is how he talks about paleo climate, which is something that's starting to get a little bit of buzz now. I think everybody's accepted that, okay, the climate is changing now, but hasn't it changed in the past? And he does dive into that. Yes, it has changed, but what he points out is the change that we're undergoing right now is unique, and he. Joe Martucci: Points out why that is. Matt Holiner: And I really liked his discussion of that. Sean Sublette: Yeah, there is so much good stuff. So let's get right to it and start up with our interview with Dr. Michael Mann. Mike Mann, it is so good to have you on the across the sky podcast. Dr. Michael Mann writes a new book about climate change called ‘Our Fragile Moment' Sean Sublette: I want to jump right into this on this book, Our Fragile Moment. This is the 6th book. What I loved about this one is that it goes a lot deeper into understanding paleo climatology. For us real science geeks out there, it really gets into depth about how we know how we got to this fragile moment. So I wanted to start on the big picture. What motivated you to write this book now? Dr. Michael Mann: Yeah. Thanks, Sean. It's great to be with all of you. All three of you know, it's interesting, this is sort of where I got my start as, a climate scientist, Paleo Climate, the hockey stick curve that my co authors and I published. it's hard to believe now, but it's, two and a half decades ago, that graph became sort of this iconic symbol, in the climate change debate. And that's really how I sort of entered the fray. And so now, two and a half decades later, I decided, well, let's do a deeper dive, because the hockey stick only went back a thousand years. That's really shallow time, as we say in Paleo climate. We've got four plus billion years of Earth history to look at and let's see what we can learn from it. And so it's sort of a return to my roots, in a sense. I hadn't really written a book about paleo climate, even though it's where I started as a scientist. And there's another sort of driving force here as well, which, relates to my last book, The New Climate War, which is about sort of the challenges we face now as climate denial becomes almost untenable, because we can all sort of see the impacts of climate change playing out. Bad actors are using misinformation to delay transition off fossil fuels Dr. Michael Mann: But there are other tactics that bad actors are using to sort of delay the transition off fossil fuels. and one of them, ironically, is doom mongering. If they can convince us that it's too late to do anything about the problem, then why bother? And so I was seeing Paleo Climate, something that I hold dear. I was seeing paleo climate science. Weaponized. Now in the same way that climate deniers used to weaponize misinformation. I was seeing climate doomers weaponizing misinformation about paleo climate to convince us it's too late, that we're experiencing runaway warming. We are going to it's yet, another mass, extinction that we've set off that's unstoppable and we will all be gone in less than ten years. There were players out there, serious protagonists who have pretty large followings, who have been spreading that sort of misinformation. So I decided, let's reclaim paleo climate. Let's look at what the science actually says. And that was the purpose of the book initially, was to address some of those misconceptions that have been used to feed climate doomism. But in the process, I realized, well, no, there's a whole lot more to talk about. there are all sorts of lessons in 4 billion plus years of Earth history. Let's see what we can learn from it for sure. Sean Sublette: Before I turn it over to the other guys for questions, I want to talk a little bit more about that doomism concept. It's important to walk a line between urgency and agency, as you like to talk about, but get away from doomism. I'd like to point out I was actually talking to a Rotary Club earlier today, that there has been progress. Right. clearly there needs to be more, but I like to point out we're starting to phase out coal globally. So there are things going how do you walk that line in terms of this is important, we need to stay on it, showing that there's progress and not succumbing to doomism for folks who are kind of depressed about it. Dr. Michael Mann: Yeah, no, absolutely. And there's sort of two pieces to it. First of all, there is just the science. Like, does the science say that we've triggered unstoppable warming and nothing we do to reduce carbon emissions is going to make a difference? No, it doesn't. And I wanted to make that very clear. And no, the paleo climate record doesn't support that. the best available science, in fact, tells us now that the planet stops warming up when we stop adding carbon pollution to the atmosphere. So there's this direct and immediate impact, on the climate of our efforts to act here. There's another piece to it, though, which is sort of there's another sort of component to doismism, which is like, we're not going to get our act together. And you could argue that remains to be seen, that's at least Arguable, the science doesn't support runaway warming. It doesn't support that sort of side of doomism. But will we garner the will to tackle this problem? Only the, future will tell. But it's interesting because you mentioned Rotary Club. There are lots of reasons for optimism. Lots of reasons. Things that we can look at, where we can say we're making real progress, rotarians have really taken a leadership role on this issue. I've spoken to some Rotary Clubs, groups in the past, and the Youth Climate movement, right. I mean, just, there is all of this energy. I see. know I teach at the University Of Pennsylvania. Climate is probably the number one issue to these students today, to these gen zers. Now, some of them fall victim to climate anxiety and climate doomism. So it's really important for them to understand the agency part of that urgency and agency duality. But yeah, the science certainly doesn't support the notion that we can't do something about the climate crisis. And the paleo climate record certainly doesn't support that either. Joe Martucci: Hey, this is Joe and just want to thank you so much for coming on again. We really appreciate it. And best of luck to you and your, book here, Our Fragile Moment. More journalists are reporting on extreme weather events linked to climate change Joe Martucci: My question does partially relate to what you said about gen zers. And some people do have climate anxiety. And if you're young, you're impressionable you're getting content from a variety of different sources, right? More than ever before, when we talk about extreme weather events and parlaying this into climate change. Right. I feel like in the past five years, maybe three years, we've seen a lot of this recently. And I think, personally, from my perspective, it's good. It's always a good teaching moment to talk about the facts and to forecast the climate science. How do you feel, though, about journalists reporting on this, as opposed to meteorologists who are experts in their field? There's many great journalists all across the country. We know that. But just like I don't know everything about maybe astronomy, right. Journals may not be completely in sync with what's happening with some of these events. Dr. Michael Mann: I don't know if you could kind. Joe Martucci: Of give us where you fall on this and how you would like to see these extreme weather events being parlayed into coverage as we go forward. Dr. Michael Mann: Thanks, Joe. It's a great question. And, you were talking about young folks, and, I used to think of myself as a young person, and then today I realized that David Lee Roth is 69 years old. I finally forced to accept the fact that I am now old. But you're right, there is this, energy and passion, among young folks. And another part of what's going on is we're seeing the impacts of climate change now play out in a profound way in the form of these extreme weather events. And there's always sort of this delicate balance in the way we cover those events. You'll often hear people say, well, you can never blame any one, weather event, on climate change. and the thinking there has evolved quite a bit. We have detection and attribution. We can characterize how likely an event was to occur in the absence of climate change and how likely it was to occur. When we consider climate change and when we see that there's a huge increase when an event is a thousand year event without climate change, and it's suddenly a ten year event when we include climate change, then we can say, hey, the fact that we saw this is probably because we've warmed up the planet and we've made these sorts of events, these extreme heat waves, heat domes that we've been reading about, wildfires floods, superstorms. So there's this scientific machinery now that allows us to sort of characterize the impact that climate change is having on these events. But you're right. When you have trained meteorologists and climate experts who are familiar with that science, they're able to sort of frame it that way. When you have just sort of say, political journalists, journalists from other fields covering, the science, it's a quandary. It's very complicated because they're hearing conflicting things. They're hearing this. You can never blame any one event on climate change, but now they know that there is a way to try to characterize the impact that climate change is having. So I think there's some confusion among in the journalistic community right now. you also sometimes see it overplayed, right, where, like, every extreme event was caused by climate change. We can't say that it's like a loading of the dice. Sixes are going to come up anyways. The fact that they're coming up so often is because we've loaded those dice, by the warming of the planet. So it is a complicated topic, and it's difficult to even trained climate and meteorology, specialists, even for us, it can be sort of challenging to explain the science and how we're able to quantify the impact climate change is having on these events. And that means that it often gets very confused in the public discourse. And at the same time, I would say that we are seeing the signal of climate change now emerge from the noise in the form of these extreme weather events. And it's a lost opportunity for certain if we don't explain that to the public. And so I personally think that there has been sort of a shift towards journalists in general, recognizing that there is a relationship and mentioning that when they talk about these events, not as often as we might like them to do, but we do see much more of that now. Climate change is part of the conversation here. And that's a real game changer, because that's where the rubber hits the road. When people realize, oh, man, it's these devastating fires. I have a friend who lost a house, or I have people, I know who got flooded, by that storm. When people start to know people who have been impacted or who have been impacted themselves, when people have their own climate story to tell, it really changes the whole conversation. And I think we're seeing that shift. Matt Holiner: Hey, Mike, it's Matt, and I think you're right about the climate change just becoming a term that everyone is familiar with now. But I think the term that people aren't as familiar with that. Matt Holiner: You mentioned your book is Paleo climate. So when you're talking about paleo climate, how far back are you looking and what are you looking at to determine what the climate was thousands or millions of years ago? Dr. Michael Mann: So it's a matter of perspective, right? If you ask my daughter what's paleo climate LBO is like, those winters when you were growing up, that's paleo climate, to me, those 1970s winters. so it's always a matter of perspective. One person's paleo climate is another person's sort of recent, climate history. I focused a lot of my early work on the last thousand years where we could pull together all sorts of types of information to try to reconstruct in some detail how the climate had changed. but there are ways to go much further back. There are sediment cores. We can look at ancient, oxygen isotopes and reconstruct what ocean temperatures were and what, sea, levels were. so there's all of this wealth of information. And so what paleo climate really means, technically, it's anything that predates the historical era of the last couple of centuries where we actually have thermometer measurements or rain gauges measurements or what have you. Anything farther back than that, where we have to turn to indirect measures of climate like tree rings or corals or ice that becomes paleo climate. And so 1000 years that's paleoclimate. But a million years is paleoclimate and a billion years is paleoclimate. And the stories are so different on these different timescales. And the puzzles are all different. And each of these intervals, there are all of these events in Earth's climate history that I talk about in the book, and we can learn something from each of them. Snowball Earth. Yes, the Earth was once entirely covered in ice and unpacking. That tells us a lot about the dynamics of the climate system. the faint early sun. The great Carl Sagan recognized that the Earth should have been frozen 4 billion years ago, when life first emerged in the oceans. And we know it wasn't because there was liquid water, there was life. And he realized because the sun was only about 70% as bright back then, the Earth should have been frozen, but it wasn't. What, what's the explanation? How come there was an even stronger greenhouse effect? And it turns out that, gets us into sort of the Gaia hypothesis because there's this remarkable story where as the sun gradually gets brighter and the Earth should have got hotter and hotter, but it didn't because the greenhouse effect got weaker over time. And in just such a way that the planet's climate, with some exceptions, like snowball Earth, stayed within habitable bounds, within bounds, that are habitable for life. Why is that? that's a really interesting puzzle. And it turns out life itself plays a role in stabilizing the climate, the global carbon cycle, the oxygenation of the atmosphere. There are all of these things that life itself did to change the composition of our atmosphere and to change the dynamics of the planet. And amazingly, life works in such a way as to help keep the climate, Earth's climate, habitable for life. And so that's an interesting puzzle. There's a lot to learn from that as well. And that's a good thing, right? There are stabilizing factors within the climate system that helps us. There is a certain amount of resilience. And that's one of the arguments against doomism that we're getting some help from the behavior of Earth's climate. There's a m safety margin. There's a margin, where we can perturb the climate, and it will stay within habitable bounds. The problem and what makes this such a fragile moment is we're now sort of at the edge of that envelope of stability. And if we continue with business as usual, we continue to pollute the atmosphere with carbon pollution, we will leave that moment behind. We, will depart from the sort of climate upon which all of this societal infrastructure was built to support now a global population of more than 8 billion people. And that's the real threat today. Sean Sublette: All right, so we're going to take a quick break. We'll come back with a couple more key questions with Michael Mann on the across the sky podcast. Stay with us. Michael Mann talks about the chemistry that helps us reconstruct past climate Sean Sublette: And we're back with Dr. Michael Mann on the across the sky podcast. The new book is our fragile moment. It is a very deep dive, as they say, into paleo climatology, and why this particular moment in time is so crucial in the climate going forward. Mike, your expertise, obviously, is in paleo climates and all these things that we use geologically to reconstruct climate. A lot of us are familiar with the ice cores. also, these oxygen isotopes, those for the weather folks, are not quite as complicated. But, what I'd like to talk about a little bit, explain some of the chemistry that's involved, that help us tell us what the climate was like. When we look at ocean sediment cores, these are things that aren't classic atmospheric proxies, right? These are much more in the rocks, geological proxies, those stalagmites, stalactites, those kinds of things. Can you talk about what are we doing with these things in terms of chemistry that tell us what we need to know? Dr. Michael Mann: Yeah, so it's amazing. There are these paleothermometers, we sometimes, call them, and you think about ice, right? Ice is frozen water. That's h 20. And so there's an O in there. There's oxygen, atoms, in that ice. And it turns out that the ratio of heavy to light isotopes of oxygen there are two main stable isotopes of oxygen oxygen 16 and oxygen 18. And the ratio, of them is a function of, the temperature. And when you form precipitation, when you condense water vapor into a droplet, there is what we call fractionation, where the heavy and the light isotopes behave differently during that process. That's true for evaporation, it's true for condensation. And so if you think about what's going on an ice core, you're drilling down in the ice, and that ice got there because it snowed at some point. And that snow was condensation of water vapor in the atmosphere. And that water vapor originally came from the evaporation from the ocean surface. And so at each stage, we have what's called a fractionation, where you're getting some sort of separation between the behavior of oxygen 16 and oxygen 18. The bottom line is, because of that, we can say things about ancient sea level from oxygen isotopes in sediment cores. We can say something about temperature from oxygen isotopes in sediment cores. We can say something about temperature from ice in ice cores on land. And it isn't just oxygen. We can look at carbon isotopes because there's carbon twelve and carbon 13, two different stable isotopes of carbon. And that allows us, for example, to figure out, what happened with carbon dioxide, and what happened with ocean acidification, how much CO2 there was, dissolved in the ocean. In fact, if you really want to get into it, we can estimate the PH of the ocean from other isotopes, boron isotopes. And I'm not going to get into the chemistry of that. But the bottom line is there are all of these amazing we call them proxy data. It's almost like nature provided us a way to sort of solve this puzzle of what happened in distant past. Almost like we were given, clues. It's like, well, I'm going to give you these isotopes, and if you're smart, and if you figure out the chemistry and the physics, you will be able to figure out what happened to sea level, what happened to ocean temperatures, what happened to the amount of ice, what happened to the acidity of the ocean. All of these things that are very relevant to how carbon pollution is impacting our environment today. Matt Holiner: And Mike, I think we've reached a point now where everybody acknowledges that the climate is changing. It took us a long time to get here, but I think we've reached that point. But what people are pointing out now is that, as you're talking about with paleo climate, the Earth's climate has changed many times over the years, warming and cooling. So what makes the climate change that we're experiencing now unique compared to the past? Dr. Michael Mann: Yeah, it's a great question, because we can certainly find times in the distant past when carbon dioxide levels, greenhouse gas levels, carbon dioxide being the main sort of greenhouse, gas that varies over time. They were higher than they are today, and global temperatures were warmer than they are today. During the Early Cretaceous Period, dinosaurs were wandering the polar regions of the planet. There was no ice on, the face of the Earth. We've seen Earth go from ice covered to ice free. So we know there are times when it's been much colder than today. And there are times when it's been considerably warmer than today. So then the question is, all right, well, then what makes climate change such a problem? Because even if we warm the planet, with carbon pollution, we're not going to get up to those Early Cretaceous levels. Well, actually, if we tried really hard, we could. If we extracted every bit of fossil fuels we could find, we could do that. Why? Because all of that carbon that was in the atmosphere slowly got deposited beneath the surface of the Earth in what we today call fossil fuels, ancient carbon, organic carbon that got buried in soils or shells that fell to the bottom of the ocean. Carbon that was in the atmosphere, got buried beneath the surface of the planet and came down from those very high early Cretaceous levels, over 100 million years. Due to those natural processes, carbon dioxide levels came down. Well, what we're doing now is we're taking all that carbon that got buried over 100 million years beneath the surface and we're putting it back into the atmosphere, but we're doing it a million times faster. We're taking carbon that was buried over 100 million years and we're putting it back up in the atmosphere over 100 years. And so I sometimes say if I was going to write a slogan for this, it would be, it's the rate, stupid. We all remember, it's the economy, stupid. I think we're old enough some of us are old enough to remember that was sort of a political sort of logo. Well, it's the rate, stupid. Which is to say it's not so much how warm the planet is or, what the CO2 levels are. It's what climate are you adapted to and how rapidly are you moving away from that climate. Because we have developed this massive societal infrastructure over a 6000 year period. Civilization, I talk about sort of the origins of civilization in Mesopotamia, 6000 years was the first true civilization. And it turns out global temperatures were remarkably stable for six, seven, 8000 years during which we developed all of this infrastructure that supports eight plus billion people. And we are dependent on the stability of that climate and its ability to continue to support that infrastructure which we've created. And if we're rapidly changing the climate and moving out of that window of variability during which we created civilization, that's a real threat. If the warming exceeds our adaptive capacity and it exceeds the adaptive capacity of other living things, life has learned to adapt to, climate changes that take place over tens of millions of years. That's pretty easy. Adapting to climate changes of similar magnitude that take place over tens of years, that's much more difficult. And again, what makes it so fragile, such a fragile moment for us is that we have leveraged the number of people who can live on this planet, what we call the carrying capacity of the planet. We've probably leveraged it by a factor of ten. Through our technology, through our infrastructure. We can support eight plus billion people because we have all of this infrastructure, agricultural infrastructure, engineering. But it's fragile, right? Because if the planet warms dramatically and that infrastructure no longer remains viable, then we can no longer support that elevated carrying capacity. Then we revert to the natural carrying capacity of the planet, which is maybe a billion people. And you think about that. The planet without our infrastructure, without our technology, probably can't support more than a billion people. We've got more than 8 billion people. That's why we can't afford to destabilize the infrastructure that supports human civilization today. And that's what dramatic warming, that's what unmitigated climate change will do. How does studying Paleo climatology make you see our place in the universe? Joe Martucci: John said, I had the last question here, so I'll wrap up with this. how does studying Paleo climatology and maybe even writing this book make you see our space or our race as humans in this universe? Because a lot of what you're talking about, you said Fragile Rights, the name of the book. How do you see our place in the universe, given what you've studied over the decade? Dr. Michael Mann: Thanks. It's a great question. and it's something I get into a little bit. Have some fun. At one point, we do some thought experiments. Some thought experiments, like, what if in one of the chapters, which is on, an episode of rapid warming, and by rapid warming, we mean, like, over 10,000 or 20,000 years rapid on geological timescales. Nothing like what we're doing today. But there was this period of relatively rapid warming, about 56 million years ago. We call it the PETM. Stands for the Paleocene eocene thermal maximum. It just rolls right off the tongue. And it was this period during which there was a massive injection of carbon dioxide into the system. Obviously, there weren't SUVs, and there weren't coal fired power plants. This was a natural input of volcanism through unusually intense volcanic eruptions, centered in Iceland, that tapped into a very carbon rich reservoir and put a very large amount of carbon dioxide into the atmosphere over a relatively short period of time. And so it turns out that you can ask the question, can we rule out the possibility that there was an intelligent civilization back then that went on this massive fossil fuel burning spree and basically extinguished themselves? And my good friend Gavin Schmidt, who's the director of the NASA Goddard Institute for Space Studies, has written a paper and has written some popular, essays about this idea because of the Silurian hypothesis. and it's basically imagine lizard people who existed 56 million. How can we rule out that that's what happened? And I grew up watching the land of the lost. And, Gavin, around the same time he was in Britain, and I think it was Dr who had a similar that's where the Silurian there were, like, these reptile beings, that basically destroyed their environment. And so it's a really interesting question. Can we rule that out? And in the process of trying to rule that out, it actually raises some really interesting questions about, what are the conditions for life? Do intelligent civilizations extinguish themselves naturally? this is sometimes called the Fermi paradox. it was something that Carl Sagan thought about if the universe is teeming. With life? How come we're not hearing from them? How come we're not getting radio signals? And it turns out you can look at all of the different how many planetary systems are there in the universe? You can sort of try to do the math and figure out how many intelligent civilizations you might expect there to be in the universe based on various assumptions. And it turns out the defining problem, all the uncertainty comes down to when intelligent civilizations emerge, how long do they persist for? Do they extinguish themselves? And that would be one explanation of Fermi's paradox. Obviously, it's very personal to us. We don't want to think that, we are on our own way to self caused extinction. So there's some deep questions there. When you look at Paleo Climate and you look at some of these past episodes, you can start to ask some larger questions that tap into these deeper philosophical questions about our place in the universe. is there life elsewhere in the universe? The thinking that you go through turns out to be very relevant to the thinking that you need to go through for, Know. And the punchline is, Adam. I'm going to draw a blank on his, so, he's a well known astrophysicist, and writes about the search for extraterrestrial life. Adam and I'm drawing a blank on his last name, which is very embarrassing. I'm, sure he'll watch this and be very upset at me. but, he actually came to Gavin because he was interested in the search for extraterrestrial life and asking some questions about climate change and climate change on other planets. and could that explain why we're not hearing from other civilizations? Because they cause climate change and they extinguish themselves. And, Adam Frank is his name, and he's a well known sort of, science communicator, astrophysics search for extraterrestrial, sort of continuing the legacy of Carl Sagan and the Planetary Society and the sorts of questions that they were asking. So he came to Gavin, who's a climate modeler, and know, I want to work on, know, figuring out if climate change could have been what caused these other potential civilizations elsewhere in the universe to extinguish themselves. And then Gavin says, how do we know that that didn't happen on Earth? And they go through this amazing sort of thought experiment, and it turns out it's hard at first blush to rule out that that's what happened. For example, the PETM. It takes quite a bit of work to convince yourself that it couldn't have been ancient lizard people that burned, fossil fuels. and so, yeah, so there's a lot you can learn from what are seemingly silly thought experiments that actually start to get at some pretty deep questions about us and our place in the universe. Sean Sublette: We know not all questions are silly. What plate tectonics has only been around for about 100 years or so. And everybody kind of thought, well, that was silly at the time. Dr. Michael Mann: Mike, we're going to stickers stop plate tectonics bumper stickers. Sean Sublette: Yeah, we're going to let you go. But, again, the book is our fragile moment. Social media is a mess nowadays, but where's the best place people can find you digitally and online? Dr. Michael Mann: Well, they can still find me on, what are we calling it this day? X. that's what it's called this week. But, I've sort of diversified. You can find me pretty much on all of the major social media platforms now. I'm still on Twitter. X, and, Instagram and mastodon and Blue, sky, and I'm forgetting threads. It's like, now we've got to be so diversified because we're no longer confident we can rely on the one that we were all relying on for so long. But, yeah, I'm out there and people can find me at WW Michaelman Net. So, yeah, it was great talking with you guys and I, hope to do so again. Sean Sublette: Mike, appreciate it so much. Take care. travel safely. Good luck promoting the book. and it's great. I mean, I've read it. It's just wonderful. And also, I will say this publicly. Thanks for the little shout out at the back, my friend. Dr. Michael Mann: Thank you, my friend. It was great talking with you guys. Sean Sublette: Those are some very deep answers, guys. where is our place in the universe and this concept of lizard people from 50 OD million years ago. and the things you will go down the road you will go down when you start doing these thought experiments. But for me, the importance here, I think what Mike said is the pace of the warming is without precedent. What we're doing is happening so fast, it is going to be difficult to adapt. Some things are going to adapt more easily than others. And that's why this moment in time is so particular. Yeah, it's been warmer in the past, but our civilization, which is increasingly global over these last 2000, 3000 years in particular, last couple of hundred years, where the population has just blossomed, really kind of dependent on the climate that we have out there now. Guys, what do you think? Joe, what did you kind of take away from? Joe Martucci: Well, you know, anytime we talk about our place in the really, I don't know, just really focused on the topic because it does make you think about in some ways, how small we are relative to everything. And not just even planet Earth and the spec of the universe, but also human life in the span of the Earth's long, long history. And like he also said a few minutes before that question, it's the rate of change of the warming that's unique. I say this a lot of times when I do public talks. I said, listen, yeah, we've been warmer than we've been before, we've been colder than we've been before. But barring like an asteroid or some cataclysmic event, this is the only time we're really changing at such a rate. and there's facts and forecasts, and then there's what to do or not to do about it. And that's where your beliefs come in. But there's no denying that the rate of change, a lot of this is significant and something we haven't seen really in the scope of human history. And beyond that, the Earth's history, again, minus the early millions, billion, two or four years, when the Earth was really trying to just get itself together, for lack of a better word. And in some of these asteroid or supervolcano events, it happened as well. Matt Holiner: I would say this was a humbling conversation, because also at the end, when he was talking about why haven't we encountered other intelligent life? And then the comment that stood out to me is like, maybe it has existed, but because of their actions, resulted in their own extinction, and are we headed down that path? And is that why we haven't encountered intelligent life? And then, the other comment that he made is when he was talking about carrying capacity, and now the Earth has a population of 8 billion. But you take out our technology, and what we could see if we continue on this path, if the climate continues. To the rate the change that it's. Matt Holiner: Experiencing now, that carrying capacity could drop to a billion. And then you think, you think about going from a population of 8 billion people to 1 billion, 7 billion people disappearing. That makes the hair stand your, arms and to think about could we result in our own extinction by our actions? And when you hear that, you want to say, let's not make that mistake, let's do something about this. Because again, the other comment was it's the rate stupid? And he talks about, yes, climate has changed in the past. And that's what some people keep coming out. It's like, well, what's the big deal if the climate has changed the past? We're just going through another cycle, but it's never changed at this pace and. Joe Martucci: We can't keep up. Matt Holiner: He also talked about the planet has taken care of itself. When the sun became stronger, the greenhouse effect decreased. And so there has been that the Earth has all these protections in place to kind of keep the climate in balance. But we're breaking that. We're breaking these natural protections. That's why he calls it our fragile moment. Because if we continue at this pace, the Earth isn't going to be able to heal itself. And so we have to take action to make sure we don't lose 7 billion people. So, again, we don't want to talk about the doomism. So it's a fine balance, though, because we absolutely have to take action, but know that we can take action. This is not hopeless. We still have time to fix this. Problem, so let's get on it. Sean Sublette: Yeah, as he says, there is urgency, but there is also agency. So I think that that's the quote that I like from him, most of all. So as we look to some other episodes coming down the pike, a little bit less heady. coming up next week, we've got Paul James of HGTV. We're going to look at the science of changing leaves. We are thick into, the fall right now, the leaves changing from north to south across the country, and we're also working in the background to bring you a broader winter forecast. We're still turning a couple of knobs on that, but we're working on that. I'll be talking to Neil degrasse Tyson in a few weeks. We'll bring that to the podcast. also I've talked to a couple of colleagues, the fifth national climate assessments coming out, and we're going to say, well, what does that mean and why should we care? We'll answer those questions. we've got one more, Joe. you've got somebody coming in from Ohio State, right? Joe Martucci: Yeah, we do. That's coming up in a couple of weeks. That's for your, November 6 episode. We're speaking with Dr. Lawrence Sutherland, and it's tips prepare older loved ones in case of natural disasters or extreme weather. I've covered this topic a, number of times for the press of Atlantic City, where I'm based out of shout out to everybody listening Jersey, but talking about, some of the challenges our senior citizens are having when there are these kind of extreme weather events. so that should be really good. I'm looking forward to that one, too. And that one comes out on November. Sean Sublette: So we have got a lot of good stuff in the pipeline in the weeks ahead, but for now, we're going to close up shop. So for Joe Martucci at the Jersey Shore. Matt Hollner in Chicagoland. I'm meteorologist Sean Subletz at the Richmond Times dispatch. We'll talk with you next time. Thanks for listening to the across the sky podcast.See omnystudio.com/listener for privacy information.
Summary: This little known amphibian has 200 different species in its ranks. Join Kiersten as she takes you on a quick tour of the different caecilian species. For my hearing impaired listeners, a complete transcript of this podcast follows the show notes on Podbean. Show Notes: The Amphibian Class by Rebecca Stefoff https://www.britannica.com/animal/caecilian-amphibian/classification Music written and performed by Katherine Camp Transcript (Piano music plays) Kiersten - This is Ten Things I Like About…a ten minute, ten episode podcast about unknown or misunderstood wildlife. (Piano music stops) Welcome to Ten Things I Like About… I'm Kiersten, your host, and this is a podcast about misunderstood or unknown creatures in nature. Some we'll find right out side our doors and some are continents away but all are fascinating. This podcast will focus ten, ten minute episodes on different animals and their amazing characteristics. Please join me on this extraordinary journey, you won't regret it. This episode continues caecilians and the fourth thing I like about this unknown animal is the number of species that we know about. I have to admit as I was doing my research into the caecilian I was amazed to discover that we actually know of about 200 species of this amphibian. Most of my friends and family looked at me with blank faces when I mentioned that I wanted to do the next series of Ten Things I Like About on caecilians. I had a few people ask me if it was going to be about people from Sicily. (laughs) Clearly not. This episode will include a lot of scientific names so I apologize in advance but most caecilians don't have common names since they are not very well known. Let's start off with a little taxonomy, that's the scientific classification of all living things. All caecilians are in Kingdom Animalia, as are humans, Phylum Chordata, because they are vertebrates with a skeletal system, Class Amphibia, because they are amphibians, Subclass Lissamphibia, and Order Gymnophiona also known as Apoda which is Latin for “without foot”. Within this Order there are ten Families of caecilians. The different Families of caecilians are distinguished from each other based on physical characteristics and life history. The extant, or living species, are classified by the absence or presence of a tail, the amount of fusion of the skull bones, the degree of movement in the skull, the nature of the annular grooves (these are the cutaneous grooves that circle the body), and the structure of the phallodeum (which is the male's sex organ). Classification is also based on whether an aquatic larval stage is present in the life history of the caecilian and whether they lay eggs or have live birth. The youngest family of caecilians is Family Caeciliidae. The species in this family date from the Paleocene era which is 65 to 55 million years ago to today. They have no tails and most have no aquatic larval stage. There are 42 species in Family Caeciliidae. They are native to Central and South America and as adults they range in size from 4 to 60 inches. The next seven families all date from the Cretaceous period which is 145 to 65 million years ago to today. Family Dermophiidae includes 13 species. They have secondary annuli with annular scales. They are viviparous which means they give live birth and they are found in Africa and Central and South America. Family Herpelidae, commonly known as the African caecilians, is native to Africa and includes 9 species of caecilian. Family Ichthyophiidae species have tails, an aquatic larval stage and are native to Southeast Asia, peninsular India, Sri Lanka, Sumatra, Borneo, and the Philippines. There are 50 species in this family that range in size from 16 to 20 inches as adults. This family is also known as the Asiatic tailed caecilians or the fish caecilians. I couldn't determine why they are called fish caecilians but they do have an aquatic larval stage. Family Indotyphlidae is native to Africa, the Seychelles, and India. There are 21 speices in this family. Some of them are viviparous and some of them are oviparous which means they lay eggs to reproduce. The viviparous species do not have scales or secondary annuli. The characteristics that bond these species together are their non-perforated ear bone and the presence of teeth in the lower jaw. Family Rhinatrematidae has tails and aquatic larvae. The 11 species of this family are native to South America and range in size from 10 to 13 inches as adults. This family is also known as the Neotropical tailed caecilians, the American tailed caecilians, or the beaked caecilians. Family Siphonopidae, also known as common caecilians, have non-perforated ear bones and no teeth in the lower jaw. The 19 species of this South American caecilian family are oviparous. Our last family originating in the Cretaceous period is Family Typhlonectidae. These caecilians have no tails. Adults are aquatic, so these caecilians live their entire lives in the water. The young have gills but the adults breathe through tracheal lungs. There are 13 species in this family and adults range in size from 20 to 28 inches. Family Typhlonectidae is native to South America and are also known as rubber eels. Our last two families are our two oldest species and originate in the Jurassic period which is 200 to 145 million years ago. Family Scolecomorphidae is native to Africa and only contains 6 species. They have no tail and no aquatic larval stage. Adults range in size from 16 to 18 inches. They are also known as tropical caecilians, the buried-eyed caecilians, or the African caecilians. Family Chikilidae is the most recently discovered family but they are one of the two oldest living caecilians. The seven species of this family have two rows of teeth on their lower jaw and are native to northeastern India. The year 2012 brought this terrestrial caecilian into the light and is named after chikila, the northeastern Indian tribal name for this amphibian. Now that we've talked a bit about the different families of caecilians let's talk about colors! In the anatomy episode we learned that all capelins essentially look like earthworms, They have no legs, they have annuli that make their skin look segmented, and they are covered in slimy mucus. But we didn't discuss what colors they come in. Yes! I said colors. Many caecilians, actually a lot of caecilians, are a gray to black color, but not all. Some caecilians are blue, some are red or orange, some have accentuated annuli that gives them a two-toned ringed appearance. Some even have bright yellow striping that runs from their head to their tails! Considering all caecilians are blind and live in mostly dark places, we're not entirely sure why they have different colors, but boy are they pretty. Siphonops annulatus is a beautiful azure blue color, the sticky caecilian is dark gray with a yellow stripe down the midline of their body, the Sao Tome caecilian is bright yellow all over, the Panamanian caecilian is lime green! With 200 different species their color possibilities are quite varied. They vary drastically in size as well. The largest caecilian is Caecilia thompsoni and this species measures in at a whopping 5 feet long! Holy Smokes! They can weigh up to 2.2 lbs. If you'd live to get a chance to see this caecilian plan a visit to Columbia, as this is their native country. The smallest caecilian is a tie between Idiocranium russeli from West Africa and Grandisonia brevis, from the Seychelles. These two species grow to only 4 inches. That is quite a difference in size! Boy caecilians sure as fascinating. Well that's it for caecilian species, try saying that five times fast, and I know you had a great time with this episode because it's my fourth favorite thing about caecilians. If you're enjoying this podcast please recommend me to friends and family and take a moment to give me a rating on whatever platform your listening. It will help me reach more listeners and give the animals I talk about an even better chance at change. Join me next week for another thing I like about caecilians! (Piano Music plays) This has been an episode of Ten Things I like About with Kiersten and Company. Original music written and performed by Katherine Camp, piano extraordinaire.
Tier One Silver's (TSXV: TSLV, OTCQB: TSLVF) CEO Peter Dembicki and Exploration SVP Christian Rios provided us with a sponsor update. Extensive CSAMT surveying has identified two promising copper porphyry targets. Drill targets are currently being defined. This will be a focus of their Q2 '23 5000-meter drill program. CEO Dembicki explains that “While silver remains the focus at Curibaya, we have a fantastic potential porphyry target … that can't be ignored. We're on a prolific copper porphyry belt in Southern Peru with many giant mines, all within 100 kilometers of us to the north and south. We just happen to be in a fortunate situation where we have a preserved precious metals epithermal system and then residing below is this potential copper porphyry target.” SVP Rios said, “We believe the targets we've identified could be associated with a porphyry copper system at depth, particularly considering the absolute dating results, which indicate the mineralization to be from the Paleocene era. This provides further evidence that we are in the correct regional environment as the similar Paleocene-aged giant porphyry copper deposits nearby. We look forward to testing these strong targets in our next drill campaign.” CEO Dembicki reflected that while metals' prices have come roaring back ($24 silver and $4 copper) and Tier One's share price is up 50%, it's still very early in the cycle and he's expecting a major move ahead. Once the next drill program commences, Tier One will become the tier one choice for sector investors, which is why we're maintaining our position. Visit the company's website at www.TierOneSilver.com.
The Western Interior Seaway was a large inland sea that existed from the early Late Cretaceous to earliest Paleocene, splitting the continent of North America into two landmasses, Laramidia to the west and Appalachia to the east. Tanis in North Dakota was the northern end of the seaway where the catastrophic events occurred. --- Send in a voice message: https://anchor.fm/you-betterknow4/message
The Western Interior Seaway was a large inland sea that existed from the early Late Cretaceous to earliest Paleocene, splitting the continent of North America into two landmasses, Laramidia to the west and Appalachia to the east. Tanis in North Dakota was the northern end of the seaway where the catastrophic events occurred. --- Send in a voice message: https://anchor.fm/you-betterknow4/message
What's the largest snake in the world? Well, if we're talking about snakes alive today, then the longest snake is the Reticulated python. But the heaviest snake is the Anaconda. However, if you wanna know how big was the biggest snake that has ever lived, prepare to be amazed. So, imagine you went back in time and are strolling through the jungles of the Paleocene. Ferns and trees are huge, and this one trunk is especially enormous. And then it moves. Tough luck! You've met the biggest snake that ever slithered on Earth – the Titanoboa. And Anacondas or Reticulated pythons would be like spaghetti next to this creature... Learn more about your ad choices. Visit megaphone.fm/adchoices
Photo: The Paleocene, or Palaeocene, is a geological epoch that lasted from about 66 to 56 million years ago. It is the first epoch of the Paleogene Period in the modern Cenozoic Era. 7/8: Otherlands: A Journey Through Earth's Extinct Worlds, by Thomas Halliday Hardcover – February 1, 2022 https://www.amazon.com/Otherlands-Journeys-Earths-Extinct-Ecosystems/dp/0593132882/ref=pd_bxgy_img_sccl_1/139-3114007-6820565?pd_rd_w=q9bMH&content-id=amzn1.sym.6b3eefea-7b16-43e9-bc45-2e332cbf99da&pf_rd_p=6b3eefea-7b16-43e9-bc45-2e332cbf99da&pf_rd_r=861DVHNT17NQGPGYMX3W&pd_rd_wg=cvdIf&pd_rd_r=8d2d61ff-df22-48a6-bc73-b851700178a1&pd_rd_i=0593132882&psc=1 The past is past, but it does leave clues, and Thomas Halliday has used cutting-edge science to decipher them more completely than ever before. In Otherlands, Halliday makes sixteen fossil sites burst to life on the page. This book is an exploration of the Earth as it used to exist, the changes that have occurred during its history, and the ways that life has found to adapt―or not. It takes us from the savannahs of Pliocene Kenya to watch a python chase a group of australopithecines into an acacia tree; to a cliff overlooking the salt pans of the empty basin of what will be the Mediterranean Sea just as water from the Miocene Atlantic Ocean spills in; into the tropical forests of Eocene Antarctica; and under the shallow pools of Ediacaran Australia, where we glimpse the first microbial life. Otherlands also offers us a vast perspective on the current state of the planet. The thought that something as vast as the Great Barrier Reef, for example, with all its vibrant diversity, might one day soon be gone sounds improbable. But the fossil record shows us that this sort of wholesale change not only is possible but has repeatedly happened throughout Earth history. Even as he operates on this broad canvas, Halliday brings us up close to the intricate relationships that defined these lost worlds. In novelistic prose that belies the breadth of his research, he illustrates how ecosystems are formed; how species die out and are replaced; and how species migrate, adapt, and collaborate. It is a breathtaking achievement: a surprisingly emotional narrative about the persistence of life, the fragility of seemingly permanent ecosystems, and the scope of deep time, all of which have something to tell us about our current crisis.
It may have been the largest carnivore that ever lived. Megalodon was a giant shark that ate whales! In this episode you'll learn just how big it really was!!!!
It was the largest snake that ever lived! In this episode we learn about Titanoboa, the HUGE constrictor that lived in the swamps of what is now, Columbia. Dinosaur George answers several questions submitted by the listeners, and then gives his opinions of numerous "Who Would Win" battles!
The PETM has been called the largest natural climate change event of the Cenozoic Era. It marks the transition from the ecosystems of the Paleocene to the more familiar world of the Eocene and is thus an important step in making the world the way we know it today. But maybe most importantly, it is a dramatic case study in what happens when a huge amount of Carbon injected into the atmosphere triggers rapid warming of global climate … you know, in case anyone needs to know about that. In the news: pterosaur cousins, oldest pythons, burrowed dinosaurs, and hibernating hominins. Time markers: Intro & Announcements: 00:00:00 News: 00:04:30 Main discussion, Part 1: 00:32:30 Main discussion, Part 2: 01:03:00 Patron question: 01:36:30 Check out our blog for bonus info and pictures: http://commondescentpodcast.wordpress.com/ Find merch at the Common Descent Store! http://zazzle.com/common_descent Follow and Support us on: Patreon: https://www.patreon.com/commondescentpodcast Twitter: https://twitter.com/CommonDescentPC Facebook: https://www.facebook.com/commondescentpodcast Instagram: @commondescentpodcast PodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2 YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduw The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org. Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/
Join our host, Melissa Sikes as she speaks with returning guest, David Cordie, Assistant Professor of Geoscience at Edgewood College. In this episode, we discuss the asteroid event that is known to have been a leading cause of the mass extinction of the most of Earth's species, including the dinosaurs.
In a programme first broadcast in 2017, Melvyn Bragg and guests discuss the high temperatures that marked the end of the Paleocene and start of the Eocene periods, about 50m years ago. Over c1000 years, global temperatures rose more than 5 C on average and stayed that way for c100,000 years more, with the surface of seas in the Arctic being as warm as those in the subtropics. There were widespread extinctions, changes in ocean currents, and there was much less oxygen in the sea depths. The rise has been attributed to an increase of carbon dioxide and methane in the atmosphere, though it is not yet known conclusively what the source of those gases was. One theory is that a rise in carbon dioxide, perhaps from volcanoes, warmed up the globe enough for warm water to reach the bottom of the oceans and so release methane from frozen crystals in the sea bed. The higher the temperature rose and the longer the water was warm, the more methane was released. Scientists have been studying a range of sources from this long period, from ice samples to fossils, to try to understand more about possible causes. With Dame Jane Francis Professor of Palaeoclimatology at the British Antarctic Survey Mark Maslin Professor of Palaeoclimatology at University College London And Tracy Aze Lecturer in Marine Micropaleontology at the University of Leeds Producer: Simon Tillotson.
(image source: https://dinopedia.fandom.com/wiki/Titanoboa) Host Matthew Donald and guest co-host Natasha Krech discuss Titanoboa, the snake with a really uncreative name that weighed as much as a car. From the Paleocene epoch, this 42-foot constrictor just missed out on dinosaurs, so all that fan art you've seen of it crushing a T. rex or whatever was total nonsense. It's a cool image though, so who cares really? Oh yeah, paleontologists. Want to further support the show? Sign up to our Patreon for exclusive bonus content here. Also, you can purchase Matthew Donald's dinosaur book "Megazoic" on Amazon by clicking here, its sequel "Megazoic: The Primeval Power" by clicking here, its third installment "Megazoic: The Hunted Ones" by clicking here, or its final installment "Megazoic: An Era's End" by clicking here.
The gang discusses some very interesting papers about bird fossils in New Zealand. These papers describe how many different types of birds ended up on New Zealand throughout the Cenozoic, and each time they experienced significant increases in their size. Sadly, since this was a very straightforward topic, no one could quite manage to focus on anything. So meanwhile, Curt remembers childhood animations that no one cares about, James makes it “fun” for himself and no one else, Amanda drinks the unholy combination of bourbon and rye (brye?), and everything just kind of gets way too 2019 near the end (EDITOR’S NOTE: Apologies for the inconsistent audio on this episode. The wrong inputs were used for some of the audio due to some last minute changes, but this should not happen in the future). Up-Goer Five (Amanda Edition): Today our friends talk about things with no teeth that can fly that can't actually fly and live on land that has water all around it. One of these things with no teeth that can fly but can't actually fly does sort of fly, but under the water instead of in the air. The other is a very large thing with no teeth that can fly but can't fly that people will have as an animal in their house a lot of the time. These things with no teeth that can fly that people keep in their house yell a lot and can also learn to talk. The one our friends talk about is just a leg, but it was very large and probably as big as a small child. The whole animal was that big, not the leg. The other thing with no teeth that can fly but can't fly but does sort of fly under the water is very big and very old and maybe is one of the oldest ones of these things with no teeth that can't fly anymore. It seems like maybe this land with water all around it was a good place for these early things with no teeth that can fly but now can't fly but sort of fly under water, because there are many of them there at this time. And they are very old, some of the oldest ones, and very big, so maybe being big is an old thing that this group of animals does. References: Worthy, Trevor H., et al. "Evidence for a giant parrot from the Early Miocene of New Zealand." Biology letters 15.8 (2019): 20190467. Mayr, Gerald, et al. "Leg bones of a new penguin species from the Waipara Greensand add to the diversity of very large-sized Sphenisciformes in the Paleocene of New Zealand." Alcheringa: An Australasian Journal of Palaeontology (2019): 1-18.
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
The story of life concludes with the Cenozoic Era, from the Paleocene to the Pliocene epoch (66 to 2.58 Million Years Ago). We follow the survivors of the great Cretaceous Extinction Event as they adapt to a rapidly changing world, including the mammals. Special topics include the the Paleocene-Eocene Thermal Maximum, the Rise of the Himalayas, the Spread of the Grasslands, the Crisis of the Mediterranean, and the Great American Interchange. Transcript: https://riverofhistory.tumblr.com/post/183188061451/episode-6-the-age-of-mammalsLinks and References Mentioned:Placentals Didn't Displace North American Marsupials: https://www.zora.uzh.ch/id/eprint/71489/10/ZORA_NL_71489.pdfHow Neornithine Birds Survived: https://doi.org/10.1016/j.cub.2018.04.062Geology of the Pacific Islands: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607379/ Evolution of Baleen Whales: https://www.cell.com/current-biology/fulltext/S0960-9822(18)31414-3
Aaron returns to the Paleocene to keep his promise to Smidge and answer several listener questions. View full episode show notes at www.MyDogRocket.com
Melvyn Bragg and guests discuss the high temperatures that marked the end of the Paleocene and start of the Eocene periods, about 50m years ago. Over c1000 years, global temperatures rose more than 5 C on average and stayed that way for c100,000 years more, with the surface of seas in the Arctic being as warm as those in the subtropics. There were widespread extinctions, changes in ocean currents, and there was much less oxygen in the sea depths. The rise has been attributed to an increase of carbon dioxide and methane in the atmosphere, though it is not yet known conclusively what the source of those gases was. One theory is that a rise in carbon dioxide, perhaps from volcanoes, warmed up the globe enough for warm water to reach the bottom of the oceans and so release methane from frozen crystals in the sea bed. The higher the temperature rose and the longer the water was warm, the more methane was released. Scientists have been studying a range of sources from this long period, from ice samples to fossils, to try to understand more about possible causes. With Dame Jane Francis Professor of Palaeoclimatology at the British Antarctic Survey Mark Maslin Professor of Palaeoclimatology at University College London And Tracy Aze Lecturer in Marine Micropaleontology at the University of Leeds Producer: Simon Tillotson.
Melvyn Bragg and guests discuss the high temperatures that marked the end of the Paleocene and start of the Eocene periods, about 50m years ago. Over c1000 years, global temperatures rose more than 5 C on average and stayed that way for c100,000 years more, with the surface of seas in the Arctic being as warm as those in the subtropics. There were widespread extinctions, changes in ocean currents, and there was much less oxygen in the sea depths. The rise has been attributed to an increase of carbon dioxide and methane in the atmosphere, though it is not yet known conclusively what the source of those gases was. One theory is that a rise in carbon dioxide, perhaps from volcanoes, warmed up the globe enough for warm water to reach the bottom of the oceans and so release methane from frozen crystals in the sea bed. The higher the temperature rose and the longer the water was warm, the more methane was released. Scientists have been studying a range of sources from this long period, from ice samples to fossils, to try to understand more about possible causes. With Dame Jane Francis Professor of Palaeoclimatology at the British Antarctic Survey Mark Maslin Professor of Palaeoclimatology at University College London And Tracy Aze Lecturer in Marine Micropaleontology at the University of Leeds Producer: Simon Tillotson.
The Bighorn Basin in Wyoming has been an important area for research into terrestrial ecosystems for decades. The basin formed as part of the uprising of the Rocky Mountains in the west of North America, and sediment from the surrounding mountain ranges was transported into it for millions of years, building up a huge thickness that has fossils from all kinds of life on land preserved within it. Rocks from many different time periods are now exposed in the basin, but a particularly important one is the Paleocene Eocene thermal maximum (PETM) which occurred around 56 million years ago. At this time a huge amount of carbon was released into the atmosphere very quickly, causing a sharp (by geological standards) increase in temperature and dramatic effects on life. Palaeontologists and geologists are particularly interested in studying the PETM as it can potentially give us lots of information about how life and earth systems might respond in the near future to the large quantities of carbon being released into our atmosphere now by humans. In this episode recorded in the field we talk to Dr Scott Wing, who is curator of fossil plants at the Smithsonian in Washington DC but has been coming to the basin every summer for decades. We chat about the geology and history of the area, what it's like to work in the Wyoming desert every summer, how to find and collect fossil plants, and what years of research by many people in the basin has told us about the PETM.
Fakultät für Geowissenschaften - Digitale Hochschulschriften der LMU
The Antarctic Peninsula forms part of a magmatic arc at least since Jurassic times. Magmatic dykes are essential elements of such arcs and intrude along zones of instability. In contrast to other hypabyssal intrusions and the effusive products of arc activity, dykes do not only reflect the geochemical characteristics of their magma source but also the tectonic parameters at the time of their emplacement. The South Shetland Islands form an archipelago located at the northern tip of the Antarctic Peninsula and belong to this arc. Areas of up to 100,000 m2 have been mapped at several locations of these islands, mainly on King George and Livingston Island. A structural analysis of the dykes and the host rocks was carried out, and about 250 dykes were sampled for further studies. As deduced from field relationships, on Livingston Island six different intrusive events could be distinguished, on King George Island up to seven. This subdivision into different intrusive events is also well reflected by the geochemical data. Analysis of the structural data of the dykes and their host rocks shows, that the tectonic stress field was not only very similar throughout the archipelago, but that moreover only minor changes of this stress field occurred during the time of dyke emplacement. This holds for all investigated areas in the South Shetland Islands. The geochemical data (ICP-MS) reveal, that most dykes of the South Shetland Islands belong to a calc-alkaline, arc-related suite, ranging from basalts to highly differentiated rhyolites. However, especially during early stages of intrusive activity in the respective areas, also tholeiites occur. Isotopic data (Sr, Nd, Pb) prove a strong crustal component during initial stages of magmatic activity, especially on Hurd Peninsula (Livingston Island). This crustal component decreased with time, accompanied by an increase of sedimentary input into the subduction zone. The high amount of crustal contamination during the initial stages was probably due to a still unstretched continental crust. Besides the continental crust underlying the South Shetland Islands, partial melts from the subducted sediments, fluids derived from the subducting plate and a depleted, heterogeneous mantle wedge contributed to arc magma genesis. According to Ar-Ar datings on plagioclase separates and K-Ar (WR) age determinations, dyke intrusion was restricted to the Paleocene and Eocene. The dykes started to intrude around the Cretaceous/Paleogene boundary at Livingston Island. Only around the Thanetian/Ypresian boundary, dyke intrusion commenced also further NE at Nelson and King George Island, culminating during the Lutetian at 47-45 Ma in all investigated areas. Dyke intrusion then ceased in the latter areas but still continued at Livingston Island until the Priabonian. Combining the information given by the tectonic and geochemical datasets, the time interval covered by the dykes obviously marks a period of geodynamic stability. This includes a stable geometry of the subduction zone and the corresponding parameters (subduction direction and velocity) during that time, as well as stable magma sources. The contribution of the respective sources (sediments, slab, mantle, crust) varied, but the sources themselves remained the same. Very primitive, olivine tholeiitic dykes sampled on Penguin Island as a by-product of this work yielded an unexpectedly high Ar-Ar age (Tortonian), thus questioning the onset of rifting in Bransfield Strait during the Pliocene, as believed so far.
© 2020-2025 Ivy Podcast Discovery LLC
