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National Geologic Map Database

Geologic Unit: Kress

Usage:

Kress Member of St. Peter Sandstone of Ancell Group (IL)
Kress Member of St. Peter Sandstone (IL*,MO*)


Geologic age:

Middle and Late Ordovician (Whiterockian and Mohawkian)*


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

Type section (subsurface): depth-interval 940 to 1,004 ft, Elgin, Joliet and Eastern RR No. 1 (reference well 48) cable tool well, in NW/4 NE/4 SE/4 sec. 32, T. 40 N., R. 9 E., DuPage Co., northern IL. Named from Kress Creek, northwest of West Chicago, DuPage Co., IL. The creek flows southward in secs. 6, 7, and 8, T. 39 N., R. 9 E. The headwaters of the creek are about 1.5 mi southwest of type well (Buschbach, 1964).


AAPG geologic province:

Illinois basin*
Ozark uplift*
Wisconsin arch


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 ([ ]).