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National Geologic Map Database

Geologic Unit: Frederick

Usage:

Frederick Limestone (MD*,PA*,VA*)
Frederick Formation (MD*)


Subunits:

(alphabetical) --all in MD*: Adamstown Member, Lime Kiln Member, Monocacy Member, Rocky Springs Station Member.


Geologic age:

Cambrian*


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

Type area: near Frederick, Frederick Co., MD (Keyes, 1890).


AAPG geologic province:

Piedmont-Blue Ridge province*


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