Usage:
Stewartville Member of Galena Dolomite (IA,WI*)
Stewartville Member of Galena Formation (MN*)
Stewartville Member of Wise Lake Formation of Galena Group (IL,IA)
Stewartville Formation of Galena Group (MN)
Subunits:
Rifle Hill (top) and Sinsiniwa Members (MN)
[In IA and IL these members are assigned to Wise Lake Formation].
Geologic age:
Middle Ordovician*
Ordovician, Late
Type section, locality, area and/or origin of name:
Typical exposure at Old quarry, north bank of Root River, one-half mile above dam at Stewartville, Olmstead Co., MN. Named from Stewartville (Ulrich, 1911).
AAPG geologic province:
Sioux uplift*
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 ([ ]).