How did an ancient geologic fault line form this 120 mile long valley?
28:08
Is this famous Appalachian valley an impact crater or an ancient volcano?
20:46
Modern Life Depends on This Extinct Rock | Banded Iron Formations
25:39
Why did the river move at Chimney Rock...and what happens if we move it back?
17:00
How An Ancient Ocean Shaped US History
15:42
Why So Few Americans Live In Appalachia
29:02
How did wrinkled rock layers form these incredible mountains?
36:55
Appalachian Geology: Surprising Implications
25:17