Usage:
Horse Spring Formation (AZ*,CA,NV*)
Subunits:
(alphabetical): Bitter Ridge Limestone Member (NV), Lovell Wash Member (NV*), Thumb Member (AZ,NV).
Geologic age:
late Tertiary (Miocene)*
Type section, locality, area and/or origin of name:
[Type locality not designated.] Named from Horse Spring in the Virgin Mountains, Clark Co., NV (Longwell, 1921).
Principal reference section: between Lat. 36 deg. 15 min. 45 sec. and 36 deg. 19 min. 30 sec. N., Long. 114 deg. 36 min. and 114 deg. 37 min. W., Muddy Peak 15-min quadrangle, Clark Co., NV (Bohannon, 1984).
AAPG geologic province:
Great Basin 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 ([ ]).