GEOLEX database
Geologic Unit: Cambridge
Usage:
Cambridge Argillite of Boston Bay Group (MA*)
Cambridge Slate of Boston Bay Group (MA)
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Type Locality:
Cambridge, eastern MA (Shaler, 1871).
Subunits:
Tufts Quartzite Member (MA).
Unit Name History:
Named Cambridge slates (Shaler, 1869).
Areal limits (Woodworth, 1893).
Revised; Age modified (Emerson, 1917).
Revised to Cambridge Argillite; Age modified (Billings, 1929).
Revised; Age modified (LaForge, 1932).
Age modified (Billings and others, 1939; Nelson, 1974; Castle and others, 1976).
Revised; Age modified (Billings, 1976).
Age modified; Revised (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Not used (Socci and Smith, 1990)
Overview; Age modified; Biostratigraphic dating (Goldsmith, 1991).
Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
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
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 7-Jan-2007