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National Geologic Map Database

Geologic Unit: Viola

Usage:

Viola Group (OK)
Viola Limestone (OK*, and subsurface of CO*,KS*)


Subunits:

GROUP STATUS (alphabetical) --all in OK: Viola Springs Formation, Welling Formation.


Geologic age:

Late Ordovician (Mohawkian to Cincinnatian)*


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

Named from Viola, [in T. 2 S., R. 7 E., Tishomingo quadrangle, scale 1:125,000 (1901 ed.)], Johnson Co., OK (Taff, 1902).


AAPG geologic province:

Anadarko basin*
Arkoma basin
Chautauqua platform
Ouachita folded belt*
Sedgwick basin
South Oklahoma folded belt*


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 ([ ]).