Usage:
Belknap Limestone Member of Harpersville Formation of Cisco Group (TX)
Belknap Limestone Member of Thrifty Formation of Cisco Group (TX*)
Geologic age:
Late Pennsylvanian (Virgilian)*
Type section, locality, area and/or origin of name:
Named from old Fort Belknap, Young Co., Bravos River region, central northern TX; typical exposures in vicinity of Newcastle, Young Co., where it lies above the workable coal bed (Plummer and Moore, 1922a, 1922b).
AAPG geologic province:
Bend arch*
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 ([ ]).