National Geologic Map Database

Geologic Unit: Blackwater Creek


Blackwater Creek Shale Member of Little Osage Formation of /Fort Scott subgroup [informal] of Marmaton Group (MO)
Originally misspelled Backwater Creek.

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


Flint Hill sandstone facies (informal) (MO).

Geologic age:

Middle Pennsylvanian (Desmoinesian)

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

Type section: east cutbank of a tributary to Rock Fork Creek on east side of northbound land of U.S. Highway 63, 4.5 mi northwest of Browns, 2.5 mi north of a crossroad, at western edge of Finger Lakes State Park, in SW/4 SW/4 NW/4 NE/4 sec. 36, T. 50 N., R. 13 W., Browns 7.5-min quadrangle, Boone Co., central MO (Thompson and Gentile, 2004).
Reference sections: (1) can be seen in an almost continuous series of highwall exposures in secs. 5 through 20, T. 56 N., R. 14 W., Bevier South and Macon 7.5-min quadrangles, Macon Co., central MO; (2) entrance road to Hilty Quarries, Inc., on north side of Henry Co. Route H, 0.75 mi west of junction of H with Co. Route K, 3 mi west of Montrose, in NW/4 SE/4 NW/4 sec. 16, T. 40 N., R. 28 W., Johnstown 7.5-min quadrangle, Henry Co., central MO (Thompson and Gentile, 2004).

AAPG geologic province:

Cherokee basin
Forest City basin
Illinois basin
Lincoln anticline
Ozark uplift

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).