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National Geologic Map Database

Geologic Unit: Emigrant Gap

Usage:

Emigrant Gap Member of Frontier Formation (WY*)


Geologic age:

Late Cretaceous (Turonian)*


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

Type section: near Emigrant Gap, in NW/4 sec. 4, T. 33 N., R. 81 W., Natrona Co., central WY. Named from the historically significant pass called Emigrant Gap, about 10 mi (16 km) west of Casper, Natrona Co., central WY (Merewether, 1996).


AAPG geologic province:

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