Usage:
Effna Limestone (VA)
Geologic age:
Late Ordovician (Mohawkian)
Type section, locality, area and/or origin of name:
Type section: in and near McNutt quarry, about 1.5 mi southeast of Sharon Springs, Bland Co., VA. Unit named from settlement of Effna on State Highway 42, about 2 mi east of Sharon Springs (Cooper, 1944).
AAPG geologic province:
Appalachian 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 ([ ]).