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National Geologic Map Database

Geologic Unit: Boles

Usage:

Boles Member of Joachim Dolomite (IL*,MO*)
Boles Member of Joachim Dolomite of Ancell Group (IL)


Geologic age:

Late Ordovician (Mohawkian; Turinian)*


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

Type section (= type section of Defiance Member): quarry in bluffs on north side of Missouri River, 1 mi southwest of village of Matson, in northeast corner SE/4 NE/4 SW/4 sec. 4, T. 44 N., R. 2 E., [Labadie 7.5-min quadrangle], St. Charles Co., eastern MO. Named from hamlet of Boles which is on Missouri Pacific RR on south side of Missouri River and 6 mi southwest of type section (Templeton and Willman, 1963).


AAPG geologic province:

Illinois 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 ([ ]).