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.

Deposited:
Mid-Cretaceous (64 to 144 million years ago)

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

Appearance:
Slope forming, gray shales

Example:
Floor of Cache Valley in Arches National Park

 
Rock Strata
Layer Above: Mesa Verde Formation
Current Layer: Mancos Shale
Layer Below: Dakota Sandstone

Last updated: December 14, 2015

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