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National Geologic Map Database

Geologic Unit: Joppa

Usage:

Joppa Limestone Member of Ste. Genevieve Limestone (KY)
Joppa Member of Ste. Genevieve Limestone (IL,IN*)


Geologic age:

Middle Mississippian (Visean; early Chesterian)*


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

Type section: exposures on hillslope and in road ditch north of secondary road leading to Belknap, about 300 ft east of IL Highway 37, and 0.5 mi east of railroad track at Joppa Junction, in SW/4 SW/4 sec. 32, T. 13 S., R. 2 E., Dongola quadrangle, Johnson Co., 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 ([ ]).