USGS Visual Identifier
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Geologic Unit: Boston Bay

Boston Bay Group (MA*)

Proterozoic, Late*
Cambrian, Early(?)*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Type area: occurs in Boston basin which borders Boston Bay, MA (Hobbs, 1899).

(descending): Cambridge Argillite (MA*), Brighton Melaphyre (MA*), and Roxbury Conglomerate (MA*)

Unit Name History:
Named (Hobbs, 1899).
Overview (LaForge, 1932).
Age modified (Dott, 1961).
Not used on MA State Geol. Map (Zen and others, 1983).
Age modified (Socci and Smith, 1987).
Overview (Rast and Skehan, 1990).
Revised (Socci and Smith, 1990).
Overview; Age modified; Biostratigraphic dating (Goldsmith, 1991).
Overview (Reed, 1993).

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