Mazarn Shale
Geologic formation in Arkansas and Oklahoma, United States
From Wikipedia, the free encyclopedia
The Mazarn Shale is an Early Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. This interval was first described in 1892,[3] but remained unnamed until 1918 as part of a study by U.S. Geological Survey geologist Hugh Dinsmore Miser.[2]
| Mazarn Shale | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Unit of | none |
| Sub-units | none |
| Underlies | Blakely Sandstone |
| Overlies | Crystal Mountain Sandstone |
| Thickness | 1000 to 2500+ feet[1] |
| Lithology | |
| Primary | Shale |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Mazarn Creek, Montgomery County, Arkansas |
| Named by | Hugh Dinsmore Miser[2] |
Paleofauna
Graptolites
- Caryocaris
- C. wrighti[4]
- Cryptograptus
- C. antennarius[4]
- Diplograptus[4]
- Glossograptus
- G. hystrix[4]
- Mesograptus[4]
- Phyllograptus
- P. typus[4]
- Retiograptus[4]
- Tetragraptus [5]
