USGS Visual Identifier
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Geologic Unit: Patapsco

Usage:
Patapsco Formation (NJ*,PA*)
Patapsco Formation of Potomac Group (MD*,DC*,VA*,DE*,NJ*,PA*)

Age:
Cretaceous, Early*
Cretaceous, Late*




Geologic Province:
Atlantic Coast basin*





Areal Extent:
MD*
VA*
DC*
DE*
NJ*
PA*

Type Locality:
Type area: Valley of the Patapsco River, MD (Clark, 1897).

Subunits:
Informal Elk Neck beds (MD)

Unit Name History:
Named (Clark, 1897). Extended into NJ (Richards, 1962). Extended into DC (Johnson, 1962). Biostratigraphic dating (Brenner, 1963). Extended into PA (Berg and others, 1980). Overview in MD (Hansen and Drummond, 1994).

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