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National Geologic Map Database

Geologic Unit: Aarde

Usage:

Aarde Shale Member of Howard Limestone of Wabaunsee Group (IA,KS*)
Aarde Shale of Ada Group (OK)
Aarde Shale Member of Howard Formation of /Sacfox subgroup [informal] of Wabaunsee Group (MO)

["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Sacfox subgroup considered informal and should not be capitalized.]


Geologic age:

Late Pennsylvanian (Virgilian)*


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

Type locality: Aarde Farm, in NW/4 NE/4 sec. 4, T. 26 S., R. 11 E., Greenwood Co., KS (Moore, 1932; 1936).


AAPG geologic province:

Chautauqua platform*
Cherokee basin*
Nemaha 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 ([ ]).