Antrim Shale
Geological formation in Midwestern United States / From Wikipedia, the free encyclopedia
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The Antrim Shale is a formation of Upper Devonian age in the Michigan Basin, in the US state of Michigan, and extending into Ohio, Indiana and Wisconsin. It is a major source of natural gas in the northern part of the basin.
Quick Facts Type, Sub-units ...
Antrim Shale | |
---|---|
Stratigraphic range: Late Devonian | |
Type | Formation |
Sub-units | Upper Member, Lachine Member, Paxton Member, and Norwood Member |
Underlies | Bedford Shale, Ellsworth Shale, and Sunbury Shale |
Overlies | Squaw Bay Limestone, Traverse Formation and Milwaukee Formation |
Location | |
Region | Midwestern United States |
Country | United States |
Extent | Indiana, Michigan, Ohio, and Wisconsin |
Type section | |
Named for | Antrim County, Michigan |
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The Antrim Shale was defined by A. C. Lane in 1901, and named for type-section exposures in Antrim County, Michigan. The formation was previously known as the St. Cleric Shale in Michigan, and the Genesee Shale in Indiana.[1]