But it pales to what happened when the Lake Missoula icedam failed...and that failed perhaps more than once!
Yes, that was mentioned in the second link.
That's what created the badlands. Some global warming geologists think that a sudden outpouring of melted ice plunged into the North Atlantic and changed the saline ocean currents.
Earth has always been very dynamic. I guess humanity has had the misfortune of being a flea on a Jack Russell Terrier.