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National Geologic Map Database

Geologic Unit: Yankeetown

Usage:

Yankeetown Sandstone (IL*,MO*)
Yankeetown Formation (IL,MO)
Yankeetown Formation of Cedar Bluff Group (IL)
Yankeetown Member of Paoli Limestone of Blue River Group (IN*)


Geologic age:

Middle Mississippian (Visean; early Chesterian)*


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

Type section: exposures in and along northeast-flowing tributary to Horse Creek, in SE/4 NE/4 NE/4 NE/4 sec. 26, N/2 NW/4 /NW/4 sec. 25, and S/2 SW/4 SW/4 sec. 24, T. 4 S., R. 9 W., Ames quadrangle, Monroe Co., southwestern IL (Jennings and Fraunfelter, 1984).
Reference section: roadcut on U.S. Highway 61 about 1 mi northwest of town of St. Marys, southern Ste. Genevieve Co. (Thompson, 1986).
Named from Yankeetown School (Weller, 1913).


AAPG geologic province:

Illinois basin*
Ozark uplift*


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 ([ ]).