USGS Visual Identifier
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Geologic Unit: Lynn

Usage:
Lynn Rhyolite (MA*)
Lynn Volcanic Complex (MA)
Lynn Volcanics (MA)

Age:
Precambrian
Proterozoic, Late
Ordovician*
Silurian
Devonian
Geologic Province:
New England province*




Areal Extent:
MA*





Type Locality:
Type area: Lynn, Essex Co., MA (Clapp, 1910).

Unit Name History:
First used (Clapp, 1910).
Age modified (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Revised (Smith and Hon, 1984).
Overview; Age discussed; Areal limits (Goldsmith, 1991).
Revised; Age modified (Dennen, 1991).
Isotopic dating; Age modified (Hepburn and others, 1993).

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: 15-Jan-2013