Lewis Shale

Lewis Shale
Stratigraphic range:
Lewis Shale in road cut in the type area, La Plata valley, Colorado
TypeFormation
Sub-unitsDad Sandstone Member, Huerfanito Bentonite Bed, Teckla Sandstone Member.
UnderliesPictured Cliffs Formation
OverliesMesaverde Group
Thickness600 m
Lithology
PrimaryShale
OtherSandstone
Location
Coordinates37°12′54″N 108°00′22″W / 37.215°N 108.006°W / 37.215; -108.006
RegionMountain states, United States
CountryUnited States
Type section
Named forFort Lewis (former Army installation in La Plata County, Colorado)
Named byCharles Whitman Cross, A.C. Spencer, and C.W. Purington
Lewis Shale (the United States)
Lewis Shale (Colorado)

The Lewis Shale is a geologic formation in the Western United States. It preserves fossils dating back to the Campanian to Maastrichtian stages of the late Cretaceous period.

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