USGS Visual Identifier
National Geologic Map Database logo GEOLEX database

Geologic Unit: Cumberland Head

Cumberland Head Formation (NY)
Cumberland Head Formation of Trenton Group (NY,VT)
Cumberland Head Shale (NY)
Cumberland Head Argillite (NY)

Ordovician, Middle

Geologic Province:
New England province
Appalachian basin
Areal Extent:

Type Locality:
Type area: South Hero Island, Grand Isle Co., VT, 2 mi southeast of Cumberland Head. Named from Cumberland Head near Plattsburgh, Clinton Co., NY (Kay, 1937).

Unit Name History:
Named Cumberland Head shales (Cushing, 1905).
Correlations (Cushing and Ruedemann, 1910; Ulrich, 1911).
Overview (Hartnagel, 1912).
Overview (Ruedemann, 1921).
Extended into VT; Revised to Cumberland Head formation of Trenton Group; Reference area (Kay, 1937).
Revised to Cumberland Head Argillite (Fisher, 1962).

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