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Geologic Unit: Buttermilk Falls

Buttermilk Falls Limestone (NY,NJ*,PA*)
Buttermilk Falls Limestone of Hamilton Group (PA*)
Buttermilk Falls Member of Onondaga Limestone (PA)

Devonian, Early*
Devonian, Middle*
Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Crops out low on north side of Godfrey Ridge, at various places in vicinity of the Stroudsburgs, along railroad south of these boroughs, and in nearby quarries. Named from Buttermilk Falls on Marshall Creek, Monroe Co., PA (Willard, 1938).

Unit Name History:
Named Buttermilk Limestone of Onondaga Group (Willard, 1938).
Revised to Buttermilk Falls Limestone Member of Onondaga Formation (Gray and others, 1960).
Extended into NY as member of Onondaga Limestone (Rickard, 1964).
Overview (Epstein, 1966).
Buttermilk Falls Limestone included in Hamilton Group (Epstein and others, 1974).
Extended into NJ (Monteverde, 1992).
Age modified; Biostratigraphic dating (Repetski and others, 1995).
Areal limits (Drake and others, 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