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Lewis Shale
Geologic formation in the western United States / From Wikipedia, the free encyclopedia
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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.
Quick Facts Type, Sub-units ...
Lewis Shale | |
---|---|
Stratigraphic range: Campanian–Maastrichtian | |
![]() Lewis Shale in road cut in the type area, La Plata valley, Colorado | |
Type | Formation |
Sub-units | Dad Sandstone Member, Huerfanito Bentonite Bed, Teckla Sandstone Member. |
Underlies | Pictured Cliffs Formation |
Overlies | Mesaverde Group |
Thickness | 600 m |
Lithology | |
Primary | Shale |
Other | Sandstone |
Location | |
Coordinates | 37.215°N 108.006°W / 37.215; -108.006 |
Region | Mountain states, United States |
Country | ![]() |
Type section | |
Named for | Fort Lewis (former Army installation in La Plata County, Colorado) |
Named by | Charles Whitman Cross, A.C. Spencer, and C.W. Purington |
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