In this episode, we dive back into the bedrock of America to reveal which state holds the crown for the oldest rocks in the U.S.! Join us as we unravel the mysteries of ancient metamorphic formations. From the Morton Gneisses in Minnesota, to the Wyoming craton out West, and ending in Upper Michigan, you'll find out what the oldest rocks are, and how we know! Hit that subscribe button, because this episode rocks! The paper that served as the basis for this episode is Frost, C.D., Mueller, P.A., Bickford, M.E., and Stern, R.J., 2025, USA’s oldest rock? A simple question with a complex answer: GSA Today, v. 35, p. 4–10,https://doi.org/10.1130/GSATG613A.1.00:00 Introduction and Episode Overview00:50 Setting the Stage: America's Oldest Rocks02:28 Understanding Metamorphic Rocks05:18 The Importance of Rock Ages09:55 Zircon and Uranium-Lead Dating14:16 Metamorphism and Zircon Growth22:05 Metamorphic and Igneous Rock Processes23:32 Understanding Zircon Inheritance24:32 Determining Rock Ages27:21 Challenges in Identifying Rock Types31:44 Oldest Rocks in the United States36:52 Technological Advancements in Geochronology42:51 Conclusion and Further ResearchDownload the CampGeo app now at this link. On the app you can get tons of free content, exclusive images, and access to our Geology of National Parks series. You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!Like, Subscribe, and leave us a Rating!——————————————————Instagram: @planetgeocastTwitter: @planetgeocastFacebook: @planetgeocastSupport us: https://planetgeocast.com/support-usEmail:
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