USGS Visual Identifier
National Geologic Map Database logo GEOLEX database

Geologic Unit: Sugarloaf

Sugarloaf Formation of Newark Supergroup (MA*)

Triassic, Late*
Carnian, late
Jurassic, Early*
Geologic Province:
New England province*
Deerfield basin*

Areal Extent:

Type Locality:
Not designated. Named from Sugarloaf Mountain, Holyoke quadrangle, Franklin Co., MA (Emerson, 1917).

Unit Name History:
Named Sugarloaf Arkose (Emerson, 1891).
Described (Emerson, 1898; 1917).
Revised to Sugarloaf Formation of the Newark Group (Willard, 1951).
Revised (Colton and Hartshorn, 1966; Leo and others, 1977).
Age change (Cornet, 1977).
MA State Geol. Map usage (Zen and others, 1983).
Revised to Sugarloaf Formation of the Newark Supergroup (Robinson and Luttrell, 1985).

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