Basically sediment from the Appalachian region was deposited by ancient rivers and wind currents, with this sediment later being uplifted and then eroded to form the Rockies.
I’m by the river Meuse in Wallonie, which still cuts through the Ardennes, another end of same old mountain range as the Appalachians, continuously eroding while mountains uplifted (just as Indus and Brahmaputra cut through Himalayas now), before the Atlantic ocean existed. Makes you think about time, pity schools don’t teach this stuff.
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