A soaring mountain range as tall as the Himalayas once towered over the U.S. East Coast. Some 20 miles (32 kilometers) of rock have since transformed into sand and mud, exposing an outcrop of the most ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A soaring mountain range as tall as the Himalayas once towered over the U.S. East Coast. Some 20 ...