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National Geologic Map Database

Geologic Unit: Chouteau

Usage:

Chouteau Limestone (IL*,IA,KS*,MO*)
Chouteau Limestone of Knobs Group (IL-notably southeastern part)
Chouteau Limestone of Mammoth Cave Group (IL-notably southwestern part)
Chouteau Group (MO,NE)


Subunits:

GROUP STATUS: Compton Formation, Sedalia Formation, Northview Formation.


Geologic age:

Early Mississippian (Tournaisian; Kinderhookian)*


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

Type section: short valley about 0.25 mi north of Chouteau Springs, in center sec. 16, T. 48 N., R. 17 W., Cooper Co., central MO (Swallow, 1855; Moore, 1928).
Reference sections: (1) just below Clarence Cannon Dam on either side of Salt River valley, in SE/4 sec. 22 and NE/4 sec. 27, T. 55 N., R. 7 W., Ralls Co., Joanna 7.5-min quadrangle, and (2) at Buzzard Cave, in NE/4 SW/4 NW/4 sec. 5, T. 53 N., Pike Co., both in northeastern MO (Thompson, 1986).


AAPG geologic province:

Chadron arch
Denver basin
Forest City basin*
Illinois basin*
Iowa shelf
Lincoln anticline
Nemaha anticline
Ozark uplift*
Salina basin


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 ([ ]).