Usage:
Taft Hill Member of Blackleaf Formation of Colorado Group (MT*)
Geologic age:
late Early Cretaceous (Albian)*
Type section, locality, area and/or origin of name:
Type section (composite): between east face of Taft Hill and a point 5 mi east, in secs. 25 and 36, T. 21 N., R. 1 E., secs. 1 and 12, T. 20 N., R. 1 E., secs. 2, 11, and 9, T. 20 N., R. 2 E., Cascade Co., UT. Named from exposures on east slope of Taft Hill, Cascade Co., MT (Cobban and others, 1959).
Reference section (composite): in S/2 sec. 36 and 19, T. 21 N., R. 2 E., Cascade Co., MT (Cobban and others, 1976).
AAPG geologic province:
Sweetgrass arch*
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 ([ ]).