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