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National Geologic Map Database

Geologic Unit: Peterson

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).