Vampire Valley, Cedar Pass, Bad Lands National Monument
Additional Details:
| Millions of years ago before the Bad Lands were deposited, a great salt sea covered this area, it extended north to the Arctic and south as far as the Gulf of Mexico. This sea floor forms much of the western plains. There was an upheaval in the region of the Black Hills and Rocky Mountains. The sea slipped away entirely. Bad Land formations were deposited by streams which brought in sand, clay and limestone. The streams sometimes spread into shallow lakes. The wind carried in great clouds of volcanic dust and left it in varying depth to make the Bad Lands. |
