No current usage.
(†South Bend Sandstone and Shale Member of Graham Formation of Cisco Group (TX) replaced with Necessity Shale Member. See Necessity.)
Pennsylvanian
Typically exposed at South Bend, southern Young Co., central northern TX (Plummer and Moore, 1922).
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 ([ ]).