Usage:
Gilliam Limestone (TX*)
Geologic age:
Permian, Late*
Guadalupian*
Type section, locality, area and/or origin of name:
Named from Gilliam Canyon [Gilliand Canyon], Glass Mountains, Brewster Co., TX, where exposed in bluffs of its narrowest part, beginning about 10 mi north of south end of Iron Mountain, and continuing for nearly 2 mi northward (Udden and others, 1916; Udden, 1917; King, 1930 [1931]).
[Gilliland Canyon in vicinity of Lat. 30 deg. 27 min. 48 sec. N., Long. 103 deg. 14 min. 28 sec. W., Hess Canyon 7.5-min quadrangle, Brewster Co., western TX.]
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 ([ ]).