| Cason Shale | |
|---|---|
| Stratigraphic range: Ordovician-Silurian | |
| Type | Formation |
| Unit of | none |
| Underlies | Brassfield Limestone |
| Overlies | Fernvale Limestone |
| Thickness | up to appx. 23 feet[1] |
| Lithology | |
| Primary | Shale |
| Location | |
| Region | Arkansas |
| Country | United States |
| Type section | |
| Named for | Cason tract and mine, near Batesville, Independence County, Arkansas |
| Named by | Henry Shaler Williams[2] |
The Cason Shale is a Late Ordovician to Middle Silurian geologic formation in the Ozark Plateaus of Arkansas.[1] The name was introduced in 1894 by Henry Shaler Williams in his study of Arkansas.[2] Williams designated a type locality at what was known as the Cason tract and mine, near Batesville, Independence County, Arkansas, however, he did not assign a stratotype. As of 2017, a reference section has not been designated for this unit.