Usage:
New Richmond Sandstone of Prairie du Chien Group (IL*,IA,MI*,MN*,WI*)
New Richmond Sandstone Member of Shakopee Formation of Prairie du Chien Group (IA,MI*,MN*)
New Richmond Sandstone of Knox Group (IL-notably in southern part)
Geologic age:
Early Ordovician*
Type section, locality, area and/or origin of name:
Named from exposures in vicinity of village of New Richmond, St. Croix Co., WI (Wooster, 1878).
AAPG geologic province:
Wisconsin arch*
Michigan basin*
Iowa shelf*
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 ([ ]).