Usage:
Harpersville Formation (TX)
Harpersville Formation of Cisco Group (TX)
Subunits:
(alphabetical) --all in TX: Belknap Limestone Member, Bluff Creek Member, [?]Breckenridge Limestone Member, Crystal Falls Limestone Member, Curry Clay Member, Quinn Clay Member, Saddle Creek Limestone Member.
Geologic age:
Late Pennsylvanian (Virgilian) to early Permian (Wolfcampian)
Type section, locality, area and/or origin of name:
Named from town of Harpersville, 10 mi south of Breckenridge, Stephens Co., central northern TX (Plummer and Moore, 1922a, 1922b).
AAPG geologic province:
Bend arch
Llano uplift
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 ([ ]).