USGS Visual Identifier
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Geologic Unit: Tatnic Hill

Tatnic Hill Formation of the Putnam Group (CT*,MA*)

Proterozoic, Late*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Outcrops extending from CT Route 169 on east side of Tatnic Hill, west for 2.5 mi to Stetson Road in the southeast corner of the Hampton quadrangle, eastern CT (Dixon, 1964).

(ascending) Bates Pond Lentil of lower member, Fly Pond Member, Yantic Member (CT*,MA*)

Unit Name History:
Named (Dixon, 1964).
Age modified; Isotopic dating (Zartman and others, 1965).
Age modified (Goldsmith, 1980).
Extended into MA (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
CT State Geol. Map usage (Rodgers, 1985).
Age modified (Pease, 1989).

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