USGS Visual Identifier
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Geologic Unit: Tomstown

Tomstown Dolomite (MD*,PA*,VA*,WV*)
Tomstown Formation (MD,PA*,VA,WV)

Cambrian, Early*

Geologic Province:
Appalachian basin*
Piedmont-Blue Ridge province*

Areal Extent:

Type Locality:
Type area: Tomstown, Franklin Co., PA (Stose, 1906).

Benevola Member (MD*,PA*,VA*,WV*), Bolivar Heights Member (MD*,PA*,VA*,WV*), Dargan Member (MD,PA,WV), Fort Duncan Member (MD*,PA*,VA*,WV*).

Unit Name History:
Named Tomstown Limestone (Stose, 1906).
Redescribed as Tomstown Dolomite (Stose and Bascom, 1929).
Extended into MD (Stose and Stose, 1946).
Extended into WV (Woodward, 1949).
Extended into VA (King, 1950).
Tomstown Formation used (Hosterman, 1969).
Tomstown not used in WV and western VA (Ryder, 1992).
Revised to include members (Brezinski, 1992).
Members extended into VA (Southworth and Brezinski, 1996).

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