Usage:
Canyon Group (TX*)
Subunits:
(alphabetical) --all in TX: Adams Branch Limestone, Brad Formation*, Brookesmith Formation, Brownwood Shale, Caddo Creek Formation*, Cedarton Shale, Chico Ridge Limestone, Colony Creek Shale, Graford Formation, Home Creek Limestone, Jasper Creek Formation, Kisinger Sandstone [unranked], Palo Pinto Formation, Placid Shale, Posideon Formation, Ranger Limestone, Rochelle Conglomerate, Seaman Ranch Shale, Staff Limestone, Ventioner Formation, Willow Point Formation, Winchell Limestone, Wolf Mountain Shale.
Geologic age:
Late Pennsylvanian (Missourian)*
Type section, locality, area and/or origin of name:
Type area: Palo Pinto Co., TX. Named from town of Canyon, on Texas and Pacific RR, western Palo Pinto Co., 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 ([ ]).