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National Geologic Map Database

NGMDB

Geologic Unit: Platteville

Usage:

Platteville Dolomite (WI)
Platteville Limestone (IA*,MN*,WI*)
Platteville Formation (IL*,IA*,MN*,WI*)
Platteville Formation of Simpson Group (KS*-subsurface of North Kansas basin)
Platteville Formation of Sinnipee Group (WI)
Platteville Group (IL*,IA,MO,WI)
Platteville Group of /Ottawa megagroup [informal] (IL)

["Megagroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Considered informal and should not be capitalized.]


Subunits:

Hidden Falls Member (MN,WI).


Geologic age:

Middle Ordovician*


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

Typical exposures in vicinity of Platteville, Grant Co., WI (Bain, 1905).
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).


AAPG geologic province:

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


NGMDB

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 ([ ]).

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