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 published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).