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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\u2019ll discuss the answers \u2013 or lack thereof \u2013 to these questions and more as we explore this surprisingly enigmatic time in Earth history.\nIn the news: croc conservation, diving whales, aquatic mammal-cousins, and sauropod feet.\nTime 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\nWe recently appeared on the Juras-Sick-Park-Cast! https://jurassickparkcast.blogspot.com/2022/07/episode-20-when-dinosaurs-ruled-earth.html\nCheck out our blog for bonus info and pictures:http://commondescentpodcast.wordpress.com/\nJoin us on Patreon to support the podcast and enjoy bonus content! https://www.patreon.com/commondescentpodcast\xa0\nOr make a one-time donation via PayPal: https://tinyurl.com/4c68u4hp\nFind merch at the Common Descent Store! http://zazzle.com/common_descent\nJoin the Common Descent Discord server! https://discord.gg/CwPBxdh9Ev\nFollow 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\nYou 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\nThe Intro and Outro music is \u201cOn the Origin of Species\u201d by Protodome. More music like this at http://ocremix.org.\nMusical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0http://creativecommons.org/licenses/by/3.0/