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.
| Tokio Formation | |
|---|---|
| Stratigraphic range: Cretaceous | |
| Type | Formation |
| Unit of | none |
| Sub-units | none |
| Underlies | Brownstown Marl |
| Overlies | Woodbine Formation |
| Thickness | up to 300 feet[1] |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Tokio, Hempstead County, Arkansas |
| Named by | Hugh Dinsmore Miser and Albert Homer Purdue[2] |
References edit
- ^ a b McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 28.
- ^ a b 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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