Usage:
Cisco Group (OK?,TX*)
Cisco Formation (NM?)
Subunits:
GROUP STATUS (alphabetical) --all in TX: Avis Sandstone, Blach Ranch Limestone, Bunger Limestone, Crystal Falls Limestone, Finis Shale, Gonzales Limestone, Gonzales Creek Shale, Graham Formation*, Gunsight Limestone, Harpersville Formation, Moran Formation, Necessity Shale, Nimrod Limestone, Pueblo Formation*, Putnam Formation, Santa Anna Branch Shale, Sedwick Formation, Thrifty Formation*, Wayland Shale.
Geologic age:
Late Pennsylvanian (Virgilian) to early Permian (Wolfcampian)
Type section, locality, area and/or origin of name:
Named from town of Cisco, on Texas and Pacific RR, Eastland Co., TX (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
Bend arch*
Fort Worth syncline*
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 ([ ]).