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National Geologic Map Database

Geologic Unit: Oneota

Usage:

Oneota Dolomite of Prairie du Chien Group (IL*,IN,IA*,MI*,MN*,WI*)
Oneota Dolomite of Knox Group (KY*, and IL*-notably in southern part)
Oneota Formation (WI)


Subunits:

(alphabetical): Arsenal Member (IL), Blodgett Member (IL), Blue Earth Beds (MN), Coon Valley Member (IA,MN,WI), Genoa Member (WI), Gunter Sandstone Membe (IL*), Hager City Member (IA,MN,WI), Hickory Ridge Member (WI), Kasota Beds (MN), Mound Ridge Member (WI), Stockton Hill Member (MN,WI), Stoddard Member (WI).


Geologic age:

Early Ordovician (Canadian; Ibexian; Tremadocian; Skullrockian)*


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

Named from exposures on Oneota River [now called Upper Iowa River], Allamakee Co., IA (McGee, 1891).


AAPG geologic province:

Illinois basin*
Iowa shelf*
Sioux uplift*
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 ([ ]).