Usage:
Peterson Limestone of Gannett Group (ID*,WY*)
Geologic age:
Early Cretaceous (Aptian)*
Type section, locality, area and/or origin of name:
Not designated. Named from Peterson's Ranch along Tygee Creek, in sec. 34, T. 7 S., R. 46 E., Caribou Co., ID (Mansfield and Roundy, 1916).
Type section: Peterson Ranch exposures (Eyer, 1969).
AAPG geologic province:
Wasatch uplift*
Green River basin*
Snake River basin*
Yellowstone 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 ([ ]).