| Tokio Formation | |
|---|---|
| Stratigraphic range: Cretaceous | |
| Type | Formation |
| Unit of | none |
| Sub-units | none |
| Underlies | Brownstown Marl |
| Overlies | Woodbine Formation |
| Thickness | up to 300 feet |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Tokio, Hempstead County, Arkansas |
| Named by | Hugh Dinsmore Miser and Albert Homer Purdue |
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.
References
- ^ McFarland, John David (2004) . "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 28.
- ^ 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.
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