Brassfield Limestone

Brassfield Formation Stratigraphic range: Early Silurian PreЄ Є O S D C P T J K Pg N ↓
Brassfield Formation exposed in Oakes Quarry near Fairborn, Ohio.
Type	Sedimentary
Underlies	Crab Orchard Formation, Dayton Formation and Osgood Formation
Overlies	Drakes Formation
Lithology
Primary	Limestone
Other	Dolomite
Location
Region	East-central USA
Country	United States
Extent	Indiana, Kentucky, Ohio, and Tennessee
Type section
Named for	Brassfield, Kentucky
Named by	Foerste (1906, p. 18, 27)

The Brassfield Formation, named by A.F. Foerste in 1906, is a limestone and dolomite formation exposed in Ohio, Kentucky, Indiana, Tennessee and West Virginia in the United States. It is Early Silurian (Aeronian, Llandoverian) in age and well known for its abundant echinoderms, corals and stromatoporoids. In Ohio, where the unit has escaped dolomitization, the Brassfield is an encrinite biosparite with numerous crinoid species.