Mancos Shale

In northwest and west-central: Intertongues complexly with units of overlying Mesaverde Group or Fm; lower part consists of a calcareous Niobrara equivalent and Frontier Sandstone and Mowry Shale Members; in areas where the Frontier and Mowry Members (Kmfm), or these and the Dakota Sandstone (Kfd) are distinguished, map unit (Km) consists of shale above Frontier Member. In Southwest: Lower part contains Juana Lopez Member (Kmj)
State Colorado
Name Mancos Shale
Geologic age Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone

Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.

NGMDB product
Counties Archuleta - Conejos - Delta - Dolores - Eagle - Garfield - Gunnison - Hinsdale - La Plata - Mesa - Mineral - Moffat - Montezuma - Montrose - Ouray - Pitkin - Rio Blanco - Routt - Saguache - San Juan - San Miguel