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From Wikipedia, the free encyclopedia
The Brassfield Formation, named by A.F. Foerste in 1906, is a limestone and dolomite formation exposed in Arkansas,[3] Ohio, Kentucky, Indiana, Tennessee and West Virginia in the United States.[2] It is Early Silurian (Aeronian, Llandoverian) in age and well known for its abundant echinoderms, corals and stromatoporoids.[4] In Ohio, where the unit has escaped dolomitization, the Brassfield is an encrinite biosparite with numerous crinoid species.[5][6]
Brassfield Formation | |
---|---|
Stratigraphic range: Rhuddanian - Telychian[1] | |
Type | Sedimentary |
Underlies | Crab Orchard Formation, Dayton Formation, Osgood Formation, Salamonie Dolomite, and St. Clair Limestone |
Overlies | Brainard Shale, Cason Shale, Drakes Formation, and Whitewater Formation |
Lithology | |
Primary | Limestone |
Other | dolomite |
Location | |
Region | East-central USA |
Country | United States |
Extent | Arkansas, Indiana, Kentucky, Ohio, and Tennessee |
Type section | |
Named for | Brassfield, Kentucky |
Named by | August Frederick Foerste (1906, p. 18, 27)[2] |
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