USGS Visual Identifier
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Geologic Unit: Day Point

Day Point Limestone (NY*)
Day Point Limestone of Chazy Group (NY,VT)
Day Point Member of Chazy Limestone (VT)
Day Point Formation of Chazy Group (NY,VT)

Ordovician, Middle*
Chazyan, early*
Chazyan, middle*
Geologic Province:
New England province
Appalachian basin*

Areal Extent:

Type Locality:
Well exposed at Day Point, Peru Twp., Clinton Co., NY (Cushing, 1905).

FORMATION STATUS (alphabetical): Fleury Member (NY,VT), Head Member (VT), [?]Ste. Therese Member (NY,VT), Wait Member (VT).

Unit Name History:
Named (Cushing, 1905).
Extended into VT (Erwin, 1957).
Revised to member of Chazy limestone (Doll and others, 1961).
Used as Formation (Falkenberg and Mehrtens, 1993).
Overview; Age modified (Frey, 1995).

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