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b'We\\u2019ve discussed mass extinctions quite a bit on this podcast, and indeed we\\u2019ve devoted episode to four out of the famous \\u201cBig Five\\u201d that shaped life on Earth. This episode, we\\u2019re completing the set with the Ordovician mass extinction, the earliest of the five. As usual, we\\u2019ll explore what happened, who it happened to, why it happened, and how it left its mark on life on Earth.\\nIn the news: ocean crocs, early archosaurs, ancient humans, and post-extinction lakes.\\nTime markers: Intro & Announcements: 00:00:00News: 00:05:00 Main discussion, Part 1: 00:30:30 Main discussion, Part 2: 01:01:00Patron question: 01:46:00\\nCheck out our blog for bonus info and pictures:http://commondescentpodcast.wordpress.com/\\nThe Common Descent Store is open! Get merch! http://zazzle.com/common_descent\\nFollow and Support us on: Patreon: https://www.patreon.com/commondescentpodcast Twitter: https://twitter.com/CommonDescentPCFacebook: https://www.facebook.com/commondescentpodcastInstagram: @commondescentpodcast PodBean: https://commondescentpodcast.podbean.com/ iTunes: https://itunes.apple.com/us/podcast/the-common-descent-podcast/id1207586509?mt=2YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduw\\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/'