The Randall Carlson
@therandallcarlson·632K subscribers·2.1K videos
Ice Retreat Happened in Pulses, Not Smoothly
Posted
July 23, 2026
Views
40,253
Likes
1,738
Comments
50
Engagement
4.44%
July 23, 2026
40,253
1,738
50
4.44%
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He walks through the stages of post-glacial succession in a way most people never consider: the ice doesn't just melt and vanish. It retreats in pulses, leaving behind permafrost and tundra before forests can even take hold. Around 14,600 years ago, the ice began its first major pulse of retreat, and the landscape responded in phases. What is now New York was once tundra, then a hunting ground for mammoths, mastodons, saber-toothed cats, and giant ground sloths. The megafauna followed the changing ecology northward as conditions shifted. This wasn't a smooth transition. It was episodic, punctuated, driven by forces we're still working to fully understand.
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