Usage:
Wills Creek Formation (MD*,PA*,VA*,WV*)
Wills Creek Limestone (WV)
Wills Creek Shale (MD,PA*)
Subunits:
Landisburg Tongue Member or Landisburg Sandstone Member (PA).
Geologic age:
late Silurian (Ludlow)*
Type section, locality, area and/or origin of name:
Exposures on Wills Creek at Cumberland, Allegany Co., MD (Uhler, 1905).
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 ([ ]).