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National Geologic Map Database

Geologic Unit: Potosi

Usage:

Potosi Dolomite (IL*,IN, MO*)
Potosi Dolomite of Knox Group (KY*, and IL*-notably in southern part)
Potosi Dolomite of Arbuckle Group (MO*,OK*, and KS*-subsurface)
Potosi Formation (MO*,IL*)


Geologic age:

Late Cambrian (Croixan)*


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

Named from Potosi, [Potosi 7.5-min quadrangle], Washington Co., eastern MO (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Chautauqua platform*
Cherokee basin*
Illinois basin*
Ozark uplift*
Upper Mississippi embayment*


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 ([ ]).