Episode 146 - The Jurassic-Cretaceous Transition

The Common Descent Podcast

Common Descent

Science, Education, Earth Sciences, Natural Sciences, Science:natural Sciences

4.8 • 764 Ratings

🗓️ 21 August 2022

⏱️ 102 minutes

🔗️ Recording | iTunes | RSS

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Summary

Every period of geologic time is distinguished by its own environmental and ecological features, and every boundary between time periods is characterized by change. The boundary between the Jurassic Period and the Cretaceous Period is mostly marked by mystery. Was there a mass extinction? Were there catastrophic changes? Where even is the boundary exactly? In this episode, we’ll discuss the answers – or lack thereof – to these questions and more as we explore this surprisingly enigmatic time in Earth history. In the news: croc conservation, diving whales, aquatic mammal-cousins, and sauropod feet. Time markers:Intro & Announcements: 00:00:00News: 00:06:15Main discussion, Part 1: 00:36:30Main discussion, Part 2: 01:00:30Patron question: 01:33:30 We recently appeared on the Juras-Sick-Park-Cast! https://jurassickparkcast.blogspot.com/2022/07/episode-20-when-dinosaurs-ruled-earth.html Check out our blog for bonus info and pictures:http://commondescentpodcast.wordpress.com/ Join us on Patreon to support the podcast and enjoy bonus content! https://www.patreon.com/commondescentpodcast Or make a one-time donation via PayPal: https://tinyurl.com/4c68u4hp Find merch at the Common Descent Store! http://zazzle.com/common_descent Join the Common Descent Discord server! https://discord.gg/CwPBxdh9Ev Follow and Support us on: Twitter: https://twitter.com/CommonDescentPCFacebook: https://www.facebook.com/commondescentpodcastInstagram: @commondescentpodcast YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduwPodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2 You can email us at commondescentpodcast(at)gmail.comOr send us physical mail at:The Common Descent Podcast1735 W State of Franklin Rd. Ste 5 #165Johnson City, TN 37604 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 3.0http://creativecommons.org/licenses/by/3.0/

Transcript

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0:00.0	You're listening to the Common Descent Podcast.
0:19.0	Hello, Will. Hello, David.
0:21.3	Hello, out there, everybody in the world.
0:23.7	This is the Common Descent podcast, episode 146.
0:28.9	This episode, we are talking about the Jurassic Cretaceous transition.
0:33.8	Yeah.
0:34.3	A bit of an unusual episode topic for us that harkens back to our old extinction episode series.
0:42.7	Back when we used to talk about mass extinctions, we talked a lot about the boundaries between geologic time periods.
0:48.6	This is kind of like those.
0:51.8	Are we talking about a mass extinction?
0:53.7	Maybe. Stay tuned and find out.
0:56.3	Only further research will tell whether this episode is like those.
1:00.4	That is very true. We're going to talk about what makes this particular band of time,
1:07.1	particularly interesting, sort of some of the geological history, the scientific history of what we've
1:13.2	been able to tell and what big questions there are.
1:17.1	This is an unusual bound.
1:18.5	There's a lot of boundaries in Earth history where we can say, yeah, this is where the age of dinosaurs ended.
1:24.1	This is where the Ice Age began.
1:26.2	The Jurassic Cretaceous transition has a lot of
1:29.0	interesting stuff about it and a lot of big questions, such as, was there a mass extinction here?
1:35.5	Or, where is the boundary? Questions like these, we will be addressing over the course of this
1:40.9	episode. Seem kind of crucial questions.
	...

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