Roots of Mother Appalachia
https://www.cntraveler.com/story/appalachian-mountains-may-have-once-been-as-tall-as-the-himalayas
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The Rockies and most of the mountain ranges on the west coast were formed from the erosion of the Appalachian mountains!
What?
https://www.uh.edu/nsm/news-events/stories/2018/0723-geologic-history.php
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.
Wild!