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