USGS Visual Identifier
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Geologic Unit: Ohio

Ohio Shale (OH*,KY*,VA*,PA*,WV*)
Ohio Shale Member of Chattanooga Shale (KY)

Devonian, Late*

Geologic Province:
Cincinnati arch*
Appalachian basin*

Areal Extent:

Type Locality:
Ohio River hills, in the neighborhood of Rockville, Adams Co., OH (Andrews, 1870).

Huron Member (OH*,KY*,VA*,PA,WV*), Three Lick Bed (KY*,OH*,WV*), and Cleveland Member (KY*,OH*)

Unit Name History:
Named Ohio black slate (Andrews, 1870). Extended southward to southern KY; Huron and Cleveland members recognized in northern OH (Pepper and others, 1954). Three Lick Bed recognized between Huron and Cleveland Members (Provo and others, 1978). Extended into subsurface of western OH, eastern KY, westernmost PA, western WV, and westernmost VA (de Witt and Roen, 1985). Overview in KY (Kepferle, 1986) [From GNC index card files; not synopsized]. Areal limits; Overview (Robl and Barron, 1988). Revised (Chesnut, 1992). Overview (de Witt and others, 1993).

Note: If you need more information, please contact Nancy Stamm (
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Database project personnel
Last modified: 15-Jan-2013