Usage:
Trail City Member of Fox Hills Sandstone (SD)
Trail City Member of Fox Hills Formation (ND)
Subunits:
Little Eagle lithofacies, Irish Creek lithofacies (informal units).
Geologic age:
Late Cretaceous (Maastrichtian)
Type section, locality, area and/or origin of name:
Named from development around Trail City, Corson Co., SD (Morgan, Petsch, 1945). Principal reference section: E/2 SW/4 sec. 32, T. 15 N., R. 24 E., Dewey Co., SD (Waage, 1968).
AAPG geologic province:
Williston 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 ([ ]).