Usage:
Clear Fork Group (TX*)
[?] Clear Fork Formation (TX)
Subunits:
GROUP STATUS (alphabetical) --all in TX: Arroyo Formation*,Bullwagon Dolomite, Choza Formation*, Dean Sandstone, Kirby Lake Dolomite or Kirby Lake Limestone, /Lytle Limestone, Merkel Dolomite, Rainy Limestone, Standpipe Limestone, Vale Formation*.
[?] FORMATION STATUS (alphabetical) --all in TX: /Lytle Limestone Member, Rainy Limestone Member, Standpipe Limestone Member.
Geologic age:
early Permian (Leonardian)*
Type section, locality, area and/or origin of name:
Probably named from Clear Fork of Brazos River, Jones and Shackelford Cos., central northern TX (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
Bend arch
Palo Duro basin
Permian basin
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 ([ ]).