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National Geologic Map Database

Geologic Unit: Cisco

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 to Early Permian (Gzhelian to Sakmarian; Virgilian to 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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).