Usage:
Monocacy Member of Frederick Formation (MD*)
Geologic age:
Early to Middle Cambrian*
Type section, locality, area and/or origin of name:
Type section: along eastern bank of Monocacy River, near Frederick Municipal Airport, Walkersville 7.5-min quadrangle, Frederick Co., western MD; base of section approx. 500 yds north of I-70 bridge, Lat. 39 deg. 24 min. 52 sec. N., Long. 77 deg. 21 min. 46 sec. W., top of section on north side of airport near Clustered Spires Golf Course. Named from Monocacy River (Brezinski, 2004, app. 1, loc. 5).
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 ([ ]).