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 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).