Viola Formation

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Viola Formation
Formation
Location
RegionOklahoma
CountryUnited States
Type section
Named forViola, Johnston County, Oklahoma
Named byJoseph A. Taff, 1902[1]

The Viola Formation is a

period
.

See also

References

  1. ^ Taff, Joseph A. (1902). "Atoka Folio, Indian Territory" (PDF). U. S. Geological Survey Geologic Atlas of the United States. 79: 3. Retrieved 6 August 2018.