You are referring to the younger dryas period? When an asteroid vaporised the north American Ice cap? You may know a lot about this, but if you don't I suggest watching the Joe Rogan Experience Podcast on youtube, the episodes involving Randall Carlson focus specifically on this cataclysmic event, showing evidence after evidence. ;)
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Unfortunately my knowledge is marginal. I know only a little bit of MANY subjects. Jack of all trades, master of none 😀
But I don't think the docu I saw was about the asteroid stuff.
Had to do with geology and older than the asteroid event...
If you ever have a couple hours to spare a really recommend checking this video out
Goes into detail how virtually all mammals larger than humans went extinct at exactly the same time, and like how you mentioned great mountains and canyons carved over weeks rather than millions of years. It's a pretty deep rabbit hole but I went to the very bottom. :D
Cool, I will! Thank you!