Tokio Formation
Geologic formation in Arkansas & Oklahoma
From Wikipedia, the free encyclopedia
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] |
