Usage:
No current usage.
(†Pleasant Grove Schist (MD) is synonym of Mather Gorge Formation, Prettyboy Schist, and Marburg Formation. See Mather Gorge, Prettyboy, and Marburg.)
Geologic age:
Cambrian
Ordovician(?)
Type section, locality, area and/or origin of name:
Outcrops along McGill Run and southeast-flowing tributary, west and south of Pleasant Grove Church, west-central Baltimore Co., northeastern MD (Crowley, 1976).
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 ([ ]).