USGS Visual Identifier
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Geologic Unit: Bull Fork

Bull Fork Formation (KY*,IN*,OH*)

Ordovician, Late*

Geologic Province:
Cincinnati arch*

Areal Extent:

Type Locality:
Type section: roadcuts along east side of KY Route 1443, about 1.9 mi east of Springdale, Mason Co., KY (Peck, 1966).

Unit Name History:
Named (Peck, 1966).
Overview (Wahlman, 1992).
Not used (Holland, 1993).
Extended into IN (Frey, 1995).

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