USGS Visual Identifier
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Geologic Unit: Hallowell

Hallowell Limestone Member of Cobourg Formation (NY)

Ordovician, Middle
Geologic Province:
Appalachian basin
Areal Extent:

Type Locality: (See Canadian Lexicon)
Type section: at Picton, Hallowell Twp., Prince Edward Co., Ontario, Canada (Kay, 1937). [From US geologic names lexicon, USGS Bull. 1200]

Unit Name History:
Named Hallowell Member of Cobourg Formation (Kay, 1937).
[According to GNU records (USGS DDS-6; GEONAMES), is now called Hallowell Limestone Member (explanation and reference not given).]

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
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Last modified: 15-Jan-2013