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National Geologic Map Database

Geologic Unit: Cape Ann

Usage:

Cape Ann Granite (MA*)
Cape Ann Complex (MA)


Subunits:

Beverly Syenite and Squam Granite of Cape Ann Complex (MA)


Geologic age:

Late Ordovician or Early Silurian*


Type section, locality, area and/or origin of name:

Type area: Cape Ann, Essex Co., northeastern MA (Shaler, 1890).


AAPG geologic province:

New England province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).