Usage:
No current usage.
(†Millican Formation (TX) replaced with Allamoore Limestone and Hazel Sandstone. See Allamoore and Hazel.)
Geologic age:
Precambrian
Type section, locality, area and/or origin of name:
Named from Millican's Ranch, 10 mi northwest of Van Horn, [Hudspeth Co.], Sierra Diablo region, TX (Richardson, 1914).
AAPG geologic province:
Southwestern Basin-and-Range region
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 ([ ]).