Mancos Shale

photo: Slopes of mancos shale

Slopes of mancos shale


This layer does not occur in Canyonlands, but may be seen north of the park as slopes below the Book Cliffs on Interstate 70 between Green River, UT and Grand Junction, CO.

Mid-Cretaceous (64 to 144 million years ago)

Depositional Environment:
Near-shore regimes (e.g. tidal flats)

Slope forming, gray shales

Floor of Cache Valley in Arches National Park

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