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Episode #046: Potholes and Mid-continent Megafloods

While reviewing the events around the catastrophic drainings of Glacial Lake Agassiz, the ongoing question arises: What was the impulse of energy that initiated the domino procession of megafloods?  We continue to marvel at the oversized mid-continent spillways in the Dakotas, Minnesota, and Wisconsin – investigating multiple sites with the “advanced viewer” on the USGS National Map website, with particular focus on the underfit rivers, the massive potholes along the St. Croix (that we explored with Graham Hancock in 2014), and the discharges thru Lakes Nipigon and Superior. RC then broadens the connotations of “lake” to include more temporary impoundments of meltwater, which leads to a critical assessment of the current model of Lake Missoula and its Ice Dam. And in preparation for next episode’s special guest, Jerome Lesemann, we get an introduction to Canada’s extensive drumlin fields…

CBD RECOMMENDED – Listen to Randall’s experience with “CBD from the gods” after the mid-break at 54:26. They have some special deals going on right now, and in addition, for the Kosmographia audience – you can also get FREE shipping on your order!  Use code: “RCshipsFREE” (not case sensitive) when you check out at

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Scablands May REXpedition:

Podcast crew email:

Info on upcoming trips with Randall and the crew:

Small class lectures ‘Cosmography 101’ from ’06-’09 on Brad’s original channel:

Full listing of scientific papers about the Younger Dryas Impact Hypothesis:

Kosmographia logo and design animation by Brothers of the Serpent. Check out their podcast:

Theme “Deos” and bumper music by Fifty Dollar Dynasty:

Video recording, editing and publishing by Bradley Young with YSI Productions LLC (copyrights), with audio mastered by Kyle Allen.

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St Croix Dalles:

Impact at Nipigon?



#Megafloods #Agassiz #MinnehahaFalls #StCroixPotholes #YoungerDryas #Cartophile #Drumlins