Usage:
Tropico Group (CA*)
Subunits:
(alphabetical) --all in CA*: Bissell Formation, Fiss Fanglomerate, Gem Hill Formation, Kramer Beds, Red Buttes Quartz Basalt, Saddleback Basalt.
Geologic age:
Tertiary
Oligocene(?)*
Miocene*
Type section, locality, area and/or origin of name:
Type section: Rosamond Hills, within 0.5 mi west of Mojave-Tropico Road, 1 to 2 mi north of Tropico Mines, in NE/4 sec. 2, T. 9 N., R. 13 W., Rosamond 15-min quadrangle, Kern Co., CA (Dibblee, 1958).
AAPG geologic province:
Mojave 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 ([ ]).