In our modern world, there are three major groups of mammals: placentals (that’s most of us), marsupials, and the rare and bizarre monotremes. Trans Lifeline connects trans people to community support and resources: In the news: gaze following, polar pterosaurs, pachycephalosaur heads, and giant marsupials. In this episode, we’ll discuss how we can sort the events in Earth history, how we calculate specific ages for ancient materials – including a deep-dive into radiometric dating! – and most importantly, how these many techniques support and complement each other. When scientists find a new rock formation or fossil assemblage, how do they determine how old it is? The answer lies in the many varied methods of geologic dating. Join us on Patreon to support the podcast our scaly friends! Thanks to our Patrons for providing the inspiration for these interview questions! In this special episode, we talk about crocs with the croc-fanatic himself: our very own Will! Licensed under Creative Commons: By Attribution 3.0 Musical Interludes are "Professor Umlaut" by Kevin MacLeod (). The Intro and Outro music is “On the Origin of Species” by Protodome. You can email us at commondescentpodcast(at) We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: Join us on Patreon to support the podcast and enjoy bonus content! In the news: a dinosaur transition, tusked dolphins, bird flutes, and crocodile parthenogenesisĬheck out our blog for bonus info and pictures: In this episode, we’ll explore the many lineages of marine crocs that have evolved over the last 150 million years, and we’ll dive into the special adaptations that allowed them to take to the seas over and over again. Most crocodilians today can handle saltwater to some degree, but many of their ancient cousins were much more suited to a life at sea, including some of the most impressive ocean-going reptiles in history.
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