Usage:
Johnstown limestone (informal) in Allegheny Formation (PA)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
Pennsylvanian
Type section, locality, area and/or origin of name:
Johnstown, Cambria Co., PA (Chance, 1880).
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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).