Article · Wikipedia archive · Last revised Aug 12, 2026

Tokio Formation

The Tokio Formation is a Late Cretaceous geologic formation in Arkansas and Oklahoma. Named in 1919 by Hugh Dinsmore Miser and Albert Homer Purdue in their study of Arkansas. They assigned the town of Tokio, Hempstead County, Arkansas as the type locality, but did not designate a stratotype for this unit.

Last revised
Aug 12, 2026
Read time
≈ 1 min
Length
116 w
Citations
4
Source
Wikipedia ↗
Tokio Formation
Stratigraphic range: Cretaceous
TypeFormation
Unit ofnone
Sub-unitsnone
UnderliesBrownstown Marl
OverliesWoodbine Formation
Thicknessup to 300 feet1
Location
RegionArkansas, Oklahoma
CountryUnited States
Type section
Named forTokio, Hempstead County, Arkansas
Named byHugh Dinsmore Miser and Albert Homer Purdue2

The Tokio Formation is a Late Cretaceous geologic formation in Arkansas and Oklahoma.1 Named in 1919 by Hugh Dinsmore Miser and Albert Homer Purdue in their study of Arkansas.2 They assigned the town of Tokio, Hempstead County, Arkansas as the type locality, but did not designate a stratotype for this unit.

References

References

  1. McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 28.
  2. Miser, Hugh D.; Purdue, A.H. (1919). "Gravel deposits of the Caddo Gap and De Queen quadrangles, Arkansas". U.S. Geological Survey Bulletin. 690-B: 19–24.