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Geologic Unit: Blackstone

Blackstone Group (RI*,MA*)

Proterozoic, Late*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Named from typical development in lower course of Blackstone River between Woonsocket and Pawtucket, Providence Co., eastern RI (Woodworth, 1899).

Hunting Hill Greenstone (RI*,MA*), Mussey Brook Schist (RI*,MA*), Sneech Pond Schist (RI*,MA*), and Quinnville Quartzite (RI*,MA*)

Unit Name History:
Named Blackstone series (Woodworth, 1899).
Abandoned, replaced with Marlboro Formation (Emerson, 1917).
Reinstated (Quinn and others, 1949).
Subdivided (Quinn, 1971).
Revised to Blackstone Group (Goldsmith, 1980).
Extended into MA; Age modified (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Overview (Skehan and Rast, 1990).
[When referring to the Blackstone series of Woodworth (1899), please use informally. The practice of employing "series" for lithostratigraphic or lithodemic nomenclature is now regarded as improper (see ACSN, 1961, 1970; NACSN, 1983). The term "Series" is applied formally only to chronostratigraphic units.]

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