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National Geologic Map Database

Geologic Unit: Grand Falls

Usage:

Grand Falls Chert Member of Boone Formation (AR*?,KS*,MO*,OK*)
Grand Falls Chert (MO)
Grand Falls Chert Member of Keokuk Limestone (OK)
Grand Falls chert (informal) in Reeds Springs Limestone Member of Fern Glen Limestone (KS)
Recognized locally in Picher mining field area.

For informal usage, the rank or lithologic term should not be capitalized.


Geologic age:

late Early to early Middle Mississippian (Visean; Osagean)*


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

Named from development around Grand Falls [no longer exists], Newton Co., southwestern MO (Winslow, 1894; Siebenthal, 1907).
Type locality: on Shoal Creek, a few mi southwest of Joplin, MO, and about 10 mi east of Baxter Springs, KS, in N/2 S/2 sec. 28, T. 27 N., R. 33 W., Joplin West 7.5-min quadrangle, Newton Co., southwestern MO (McKnight and Fischer, 1970; MO Geol. Survey lexicon, Thompson, 2001).


AAPG geologic province:

Chautauqua platform*
Cherokee basin*
Ozark uplift*


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 ([ ]).