Formation of the Book Cliffs 72 Million Years Ago
Uploaded: June 4, 2015, 1:38 p.m. |
Modified: June 21, 2019, 10:52 a.m. |
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This video shows the environment in which the upper sandstone layers of the Book Cliffs, north of Grand Junction, Colorado, were deposited approximately 72 million years ago. The sands were deposited in coastal plain swamps. Organic matter from these swamps became the coal deposits of western Colorado.
Geologic age: 72Ma