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Brassfield Formation
The Brassfield Formation, named by A.F. Foerste in 1906, is a limestone and dolomite exposed in Ohio, Kentucky, Indiana, Tennessee and West Virginia in the United States.〔Foerste, A.F. 1906. The Silurian, Devonian, and Irvine formations of east-central Kentucky, with an account of their clays and limestones. ''Geological Survey of Kentucky, Bulletin'' 7, 369 p.〕 It is Early Silurian (Aeronian, Llandoverian) in age and well known for its abundant echinoderms, corals and stromatoporoids.〔Schneider, K.A. and Ausich, W.I. 2002. Paleoecology of framebuilders in Early Silurian reefs (Brassfield Formation, southwestern Ohio). ''Palaios'' 17: 237-248.〕 In Ohio, where the unit has escaped dolomitization, the Brassfield is an encrinite biosparite with numerous crinoid species.〔Ausich, W.I. 1984. Calceocrinids from the Early Silurian (Llandoverian) Brassfield Formation of southwestern Ohio. ''Journal of Paleontology'' 58: 1167-1185.〕〔Coogan, A.H. 1996. Ohio’s surface rocks and sediments, in Feldmann, R.M., and Hackathorn, M., eds., ''Fossils of Ohio: Ohio Department of Natural Resources, Division of Geological Survey Bulletin'' 70: 31–50.〕
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