Usage:
Rifle Hill Member of Stewartville Formation of Galena Group (MN)
Rifle Hill Member of Wise Lake Formation of Galena Group (IL)
(†Rifle Hill Member of Wise Lake Formation not adopted by the IA Geol. Survey. Is same as Stewartville Member of Wise Lake Formation. See Stewartville.)
Geologic age:
Ordovician, Late
Edenian
Cincinnatian
Type section, locality, area and/or origin of name:
Type section: Rifle Hill quarry, in NE/4 NW/4 sec. 35, T. 102 N., R. 12 W., Fillmore Co., MN (Sloan, 1987).
AAPG geologic province:
Iowa shelf
Wisconsin 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 ([ ]).