USGS Visual Identifier
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Geologic Unit: Millbach

Millbach Formation of Conococheague Group (PA*)
Millbach Member of Conococheague Formation (PA)

Cambrian, Late*
Geologic Province:
Appalachian basin*
Areal Extent:

Type Locality:
Type section: partial section measured in quarry about 0.5 mi southwest of Sheridan on south side of Mill Creek and 0.8 mi northeast of village of Millbach, Lebanon Co., PA (Gray and others, 1958).

Unit Name History:
Named (Gray and others, 1958).
Raised to Millbach Formation (Gray and others, 1960).
Overview (Meisler and Becher, 1968).
Overview (Berg and others, 1980).

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