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National Geologic Map Database

Geologic Unit: Horton Creek

Usage:

Horton Creek Formation (MO)
Horton Creek Formation of New Albany Group (IL)
Horton Creek Limestone (MO)
Horton Creek Member of Hannibal Shale (IL,MO)


Subunits:

Hamburg Oolite Bed


Geologic age:

Mississippian, Early


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

Type section: hillside on south bank of Horton Creek, in NW/4 NW/4 NW/4 sec. 6, T. 6 S., R. 5 W., Pike Co., IL (Conkin and Conkin, 1973).


AAPG geologic province:

Illinois basin
Lincoln anticline


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 ([ ]).