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National Geologic Map Database

Geologic Unit: Powell

Usage:

Powell Dolomite (AR*,IL*,MO*)
Powell Dolomite of Arbuckle Group (OK*, and KS*-subsurface)
Powell Limestone (MO*)
Powell Limestone of Arbuckle Group (OK, and KS-subsurface)
Powell Formation (AR*,MO*)


Geologic age:

Ordovician, Early*
Canadian*


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

Named from exposures at Powell Station [now relocated] on White River branch of St. Louis Iron Mtn. and Southern RR [now Missouri-Pacific RR], Marion Co., northern AR (Purdue and Miser, 1916; name credited to E.O. Ulrich, unpub. data). [Exposures 1+ mi southeast of present village of Pyatt, in secs. 4 through 6, T. 18 N., R. 17 W., Bruno 7.5-min quadrangle.]
Reference section: roadcuts on U.S. Interstate Highway I-55, in SW/4 SW/4 sec. 13 (projected), T. 38 N., R. 7 E., Weingarten 7.5-min quadrangle, Ste. Genevieve Co., southeastern MO (Thompson, 1991).


AAPG geologic province:

Ozark uplift*
Upper Mississippi embayment*
Illinois basin*
Cherokee basin*
Arkoma basin*


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 ([ ]).