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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).