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National Geologic Map Database

Geologic Unit: Platteville

Usage:

Platteville Formation (IL*,IA*,MN*,WI*)
Platteville Limestone (IA*,MN*,WI*)
Platteville Formation of Sinnipee Group (WI)
Platteville Dolomite of Sinnipee Group (WI)
Platteville Formation of Galena Group (IA)
Platteville Formation of Simpson Group (KS*-subsurface of North Kansas basin)
Platteville Group (IL*, and MO*-local)


Subunits:

GROUP STATUS (alphabetical): Grand Detour Formation (IL), Mifflin Formation (IL), Nachusa Formation (IL), Pecatonica Formation (IL*,MO*), Plattin Formation (IL*,MO*) or Plattin Limestone (IL*), Quimbys Mill Formation (IL).
FORMATION STATUS: McGregor Member (IA*,MN*,WI*), Magnolia Member (IA,MN,WI), Mifflin Member (WI), Pecatonica Member (IL*,IA*,MN*,WI*), Quimbys Mill Member (IL*,IA*,WI*).


Geologic age:

Late Ordovician (Mohawkian; Turinian)*


Type section, locality, area and/or origin of name:

Reference section: roadcut U.S. Highway 151, in NW/4 NE/4 sec. 12, T. 2 N., R. 2 W., Grant Co. (Agnew and others, 1956).
Typical exposures in vicinity of Platteville, Grant Co., WI (Bain, 1905).


AAPG geologic province:

Forest City basin*
Illinois basin*
Iowa shelf*
Sioux uplift*
Williston basin
Wisconsin arch


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).