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National Geologic Map Database

Geologic Unit: Allard

Usage:

Allard Member of Menard Limestone (IL)


Geologic age:

Late Mississippian (Serpukhovian; late Chesterian)


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

Type section: in cut at south end of tunnel on Illinois Central RR, about 0.5 mi southeast of Flatwoods, and 2.2 mi southeast of Allard College School, in SW/4 NW/4 NE/4 sec. 1, T. 13 S., R. 4 E., Brownsfield quadrangle, Johnson Co., southeastern IL (Swann, 1963).


AAPG geologic province:

Illinois 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 ([ ]).