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Lewis Shale

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Last Updated: 05 December 2020

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Lewis Shale

Lithology
OtherSandstone
PrimaryShale
Location
Coordinates371255N 1080023W / 37.2153544N 108.0062913W / 37.2153544; -108.0062913
CountryUSA
RegionMountain states , United States
OverliesMesaverde Group
Sub-unitsDad Sandstone Member, Huerfanito Bentonite Bed, Teckla Sandstone Member.
Thickness600 m
TypeFormation
Type section
Named byCharles Whitman Cross , A.C. Spencer, and C.W. Purington
Named forFort Lewis (former Army installation in La Plata County, Colorado )
UnderliesPictured Cliffs Formation

The Maastrichtian Lewis Shale in south-central Wyoming was deposit during the final major transgression and regression of the Late Cretaceous North American epicontinental sea. Information on this Formation was obtained from outcrops along margins of several basins and from well logs and cores within those basins. Regional correlations were made using biostratigraphic control, which also allowed relatively fine scale resolution of approximately 71 to 69 my ages of Lewis Shale. At least two branches of the sand-rich Sheridan delta system supply sediments that either were deposited directly within deltaic environments, or were rework and redeposit in laterally equivalent interdeltaic environments. Facies recognized within the study region are interpreted to represent nearshore, shelf, and Basin marine depositional environments. Throughout the study region, facies representing shallow-water environments are located in the north, and those representing deep-water deposits are in the south. This distribution, combined with data on ages of stratigraphic intervals, supports the conclusion that Lewis Shale was deposited during North to south progradation. Lewis Shale contains significant hydrocarbon reserves. Understanding the distribution of facies and paleogeography of formation is crucial for designing hydrocarbon exploration and development strategies for the region.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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