This layer does not occur in Canyonlands.

Deposited

Mid-Cretaceous (64 to 144 million years ago)

Depositional Environment

Near-shore regimes (e.g. tidal flats)

Appearance

Slope forming, gray shales.

Example

Slopes below the Book Cliffs along I-70 between Grand Junction, CO and Green River, UT. Floor of Cache Valley in Arches National Park.