Usage:
Retort Tongue of Phosphoria Formation (ID*,MT*,UT*WY*)
/Retort Phosphatic Shale Member of Phosphoria Formation (ID*,MT*,NV*,UT*,WY*)
[Use of simple lithic terms is preferred (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Geologic age:
Permian*
Type section, locality, area and/or origin of name:
Near head of Small Horn Canyon, just northwest of Retort Mountain, in SW/4 sec. 23, T. 9 S., R. 9 W., Gallagher Mountain 7.5-min quadrangle, Beaverhead Co., MT (McKelvey and others, 1959).
AAPG geologic province:
Montana folded belt*
Yellowstone province*
Wind River basin*
Bighorn basin*
Snake River basin*
Wasatch uplift*
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 ([ ]).