Usage:
Cottonwood Formation (AZ*)
Geologic age:
Miocene*
Type section, locality, area and/or origin of name:
[Type locality not stated.] Occurs about headwaters of Cottonwood Canyon, Oatman district, northwestern Arizona, [in Black Mountains, in S/2 sec. 25, T. 20 N., R. 20 W., in vicinity of Lat. 35 deg. 05 min. 23 sec. N., Long. 114 deg. 21 min. 27 min. W., Mount Nutt 7.5-min quadrangle, Mohave Co., AZ] (Ransome, 1923).
AAPG geologic province:
Plateau sedimentary province*
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 ([ ]).