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 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 ([ ]).