Usage:
Brad Formation of Canyon Group (TX*)
(†Brad Formation not used by TX Geol. Survey. Rocks reallocated to Ranger Limestone and Ventioner Formation of Canyon Group. See also Ranger and Ventioner.)
Subunits:
FORMATION STATUS (alphabetical) --all in TX: Placid Shale Member*, Ranger Limestone Member*, Seaman Ranch Shale Member, Ventioner Beds.
Geologic age:
Late Pennsylvanian (Missourian)*
Type section, locality, area and/or origin of name:
Named from town of Brad in Palo Pinto Co., Brazos River region, TX (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 ([ ]).