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MAP

Topo

Rock Formations

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Topo

Ecoregions

Public Lands

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BASEMAPS

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Temperature

Smoke

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WEATHER

Mancos Shale (COKm;0)

Geologic Formation in CO, UT

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Lithology

Sandstone

Shale

Geologic Age

Early Cretaceous – Late Cretaceous (145 Ma – 66 Ma ago)

Geologic Unit Label

Km

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)

— USGS

Taxonomy

Classified As

Geologic Formation