• Spires of Cedar Mesa sandstone in Chesler Park (Needles District)

    Canyonlands

    National Park Utah

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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

Did You Know?

Upheaval Dome

Upheaval Dome contains rock layers unlike any in the surrounding area. Scientists still debate whether this oddity is the remnant of a meteorite impact or a salt dome. More...