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National Geologic Map Database

Geologic Unit: Patapsco

Usage:

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


Subunits:

Informal Elk Neck beds (MD)


Geologic age:

late Early to early Late Cretaceous (Albian to Cenomanian)*


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

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


AAPG geologic province:

Atlantic Coast basin*


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).