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.

This article about a specific stratigraphic formation in the United States is a stub.