USGS Visual Identifier
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Geologic Unit: Canajoharie

No current usage.
(†Canajoharie Shale of Trenton Group (NY*) replaced with Utica Shale. See Utica.)

Ordovician, Middle*
Geologic Province:
Appalachian basin*
Areal Extent:

Type Locality:
Type section: composite[?] section along Canajoharie Creek and along Flat Creek south of Sprakers, Montgomery Co., eastern NY (Kay, 1937).

Unit Name History:
Named (Clarke, 1911).
Overview, (Ulrich, 1911; Miller, 1911).
Age modified; Biostratigraphic dating (Ruedemann, 1912).
Age modified (Cushing and Ruedemann, 1914; Miller, 1916).
Revised; Overview; Biostratigraphic dating (Kay, 1937).
Age modified; Revised (Fisher, 1961).
Not used (Fisher, 1962).
Overview (Zen, 1967).
Abandoned (Fisher, 1977).
Areal limits, USGS usage (Thompson, 1990).
Replaced (Goldman and others, 1994).

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