The Randall Carlson
@therandallcarlson·632K subscribers·2.1K videos
The Mankato Substage and Birth of the Great Lakes
Posted
June 2, 2026
Views
25,179
Likes
1,031
Comments
47
Engagement
4.28%
June 2, 2026
25,179
1,031
47
4.28%
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0:52Now PlayingSacred geometry. Ancient catastrophism. A living university built around the work that changes everything. Join Kosmogonia today here
He walks through the Mankato substage, the geological term marking the end of the last ice age in North America. Named after Mankato, Minnesota, where key research was conducted, this period saw the final melting of ice sheets within what is now the United States. During this substage, the immense glacial retreat carved out the basins that became the Great Lakes: Superior, Michigan, Huron, Erie, and Ontario. These are not minor features. They represent some of the largest freshwater bodies on Earth, formed directly by the mechanics of ice sheet collapse and meltwater drainage. The naming convention itself reflects how geology ties discovery to place, anchoring vast planetary processes in specific, studied locations.
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