Episode #067: Subglacial Flood-forms Interpretation w/ Jerome Lesemann PhD

Summary

This episode of the Randall Carlson Podcast dives into the intricate geological features of the Cordilleran Ice Sheet, particularly its Puget Lobe. The discussion incorporates evidence of catastrophic and gradual formation processes, exploring their implications on the landscape formed during the Ice Age Floods. Special attention is given to the interplay of water dynamics in the Scablands and the broader impacts on North American geology.

Key takeaways

• 1Cordilleran Ice Sheet's Puget Lobe features such as tunnel valleys and drumlins
• 2Evidence supporting both catastrophic and gradual formation explained
• 3Focus on Ice Age Floods and its geographical impact on areas like Lake Missoula and Moses Coulee
• 4Questions raised about water flow from southern British Columbia into the Scablands
• 5Reference to the Younger Dryas Impact Hypothesis as a significant geological event

Glossary terms

Source

Transcript excerpt

Stamps.com code podcast. Taxes and fees supply. This is Cosmographia, the Randall Carlson podcast. And welcome back, ladies and gentlemen, to Cosmographia, the Randall Carlson podcast. And we are joined once again by Dr. Jerome Lessman. He was with us on episode 47, gave us a great rundown on drumbling formations. And he's joining us again. And Randall, do you guys have an idea what we're going to go through today? We were working on the scab lands. Yeah, well, as all our listeners will be aware of, we've been kind of following the evidence for mega floods around the continent. And we followed up the Bonneville flood starting in Utah. We followed its route through the Snake River Valley up through Hell's Canyon. And we introduced people to Tammany Bar, where we find energetic deposits from the Bonneville flood, which was flowing north and down gradient. And we overtopped by slack water sediments of the back flooding Missoula floods. And then we showed, I think, in the subsequent episode, the formation of the Cheney-Palouse scab lands and how that flow that came down that route intersected the Snake River plain and provided the source of the water that back flooded up gradient of the Snake. Roughly, what did we figure? It was a couple of hundred miles, I think. Wasn't it 150 miles? We calculated it. Yeah, that was pretty close. Yeah. Back to Clarkston, right there at the intersection of the Snake River with the Clearwater River. And then we got into a preliminary discussion about the channel scab lands formation and the Missoula floods and so on. ...

Excerpt from Kosmographia, Jul 7, 2021. Rights remain with the original creators. Hear the full episode at the source.