Usage:
Willis Ranch Member of Word Formation (TX*)
Geologic age:
Permian, Early*
Guadalupian*
Type section, locality, area and/or origin of name:
Type section: near eastern entrance to Road Canyon, 1 mi southwest of the Old Willis Ranch site in west-central quadrant of Hess Canyon quadrangle, Glass Mountains, Brewster Co., western TX (Cooper and Grant, 1966; this is loc. 243 of R.E. King, 1931, Texas Univ. Bull., no. 3042, p. 136).
AAPG geologic province:
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 ([ ]).