Episode 167 – Geologic Dating

The Common Descent Podcast

Common Descent

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

4.8 • 764 Ratings

🗓️ 11 June 2023

⏱️ 149 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

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. 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. In the news: gaze following, polar pterosaurs, pachycephalosaur heads, and giant marsupials. Time markers:Intro & Announcements: 00:00:00News: 00:06:50Main discussion, Part 1: 00:38:45Main discussion, Part 2: 01:31:10Patron question: 02:20:18 Check out our blog for bonus info and pictures:http://commondescentpodcast.com/ Trans Lifeline connects trans people to community support and resources:https://translifeline.org/ Join us on Patreon to support the podcast and enjoy bonus content! https://www.patreon.com/commondescentpodcast We’re an Audible Affiliate Partner! Use this link for a 30-day free trial to Audible: https://www.audibletrial.com/CommonDescent 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: https://www.instagram.com/commondescentpodcast/ YouTube: https://www.youtube.com/channel/UCePRXHEnZmTGum2r1l2mduwPodBean: https://commondescentpodcast.podbean.com/ 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.
0:19.1	Hello, Will. Hello, David.
0:21.1	Hello, everybody out there and welcome to Common Descent.
0:24.7	This is episode 167.
0:27.6	This episode's topic is geologic dating.
0:31.7	This, I'm so excited to talk about it.
0:33.7	I love talking about this subject.
0:35.3	This is a very foundational concept in the realm of
0:39.8	paleontology and geology. We will be discussing in this episode, how do we know how old stuff is?
0:46.5	When we find a fossil or a fossil site or a geologic formation, how do we go about determining
0:52.6	how old that is?
0:54.5	We'll talk about the various techniques that we use, how those techniques work,
0:58.3	which means we're going to get to talk a little bit about physics and chemistry and things like that.
1:03.0	I hope you're ready for some nuclear physics, because there's going to be some nuclear physics in this episode.
1:07.5	I am always ready.
1:09.0	And then we'll talk about how we bring all those techniques together for a cohesive
1:12.7	understanding of ages of things in the history of our history.
1:19.6	This, like I said, this is one of those episodes like Play tectonics or sort of a companion
1:25.2	episode to this one, the geologic timescale episode.
1:27.8	Yes.
1:28.2	That is, this is a concept that underlies basically all the episodes that we have had
1:33.3	elsewise in this podcast.
	...

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