Usage:
Big Mountain Shale Member of Keyser Limestone (VA*,WV*)
Geologic age:
late Silurian*
Type section, locality, area and/or origin of name:
Named from exposures at Big Mountain, about 1.5 mi west of village of Upper Tract, Pendleton Co., northern WV (Swartz, 1929).
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 ([ ]).