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National Geologic Map Database

Geologic Unit: Graford

Usage:

Graford Formation of Canyon Group (TX*)


Subunits:

(alphabetical) --all in TX: Adams Branch Limestone Member*, Brownwood Shale Member*, Cedarton Shale Member*, Posideon Shale Member, Rochelle Conglomerate Member, Staff Limestone Member*, Wiles Limestone Member*, Winchell Limestone Member, Wizard Wells Limestone [Member], Wolf Mountain Shale Member.


Geologic age:

Late Pennsylvanian (Missourian)*


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

Named from town of Graford, in Palo Pinto Co. [Brazos River region], TX, where it is typically developed, and where the upper members form prominent escarpment just west and north of town (Plummer and Moore, 1922).


AAPG geologic province:

Bend arch*
Fort Worth syncline*


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 ([ ]).