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National Geologic Map Database

Geologic Unit: Jacksboro

Usage:

No current usage.
(Rocks of †Jacksboro Formation of Cisco Group (TX) reallocated Graham Formation. See Graham.)


Geologic age:

Late Pennsylvanian (Virgilian)


Type section, locality, area and/or origin of name:

Notable exposures in sandstone hills southwest of Jacksboro, Jack Co., and also in Young Co., central northern TX (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Bend arch
Fort Worth syncline


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 ([ ]).