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National Geologic Map Database

Geologic Unit: Franson

Usage:

Franson Member of Park City Formation (CO*,ID*,MT*,UT*,WY*)
Franson Tongue of Park City Formation (CO*,ID*,MT*,UT*,WY*)


Geologic age:

Middle Permian (early to middle Guadalupian; Roadian to Wordian)*


Type section, locality, area and/or origin of name:

Named from exposures on north side of Franson Canyon near the mouth, in S/2 SE/4 sec. 15, and N/2 NE/4 sec. 22, T. 1 S., R. 6 E., Summit Co., eastern UT (Cheney, IN McKelvey and others, 1956, 1959).


AAPG geologic province:

Bighorn basin*
Great Basin province*
Green River basin*
Montana folded belt*
Snake River basin*
Uinta basin*
Uinta uplift*
Wasatch uplift*
Wind River basin*
Yellowstone province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).