Missouri Mountain Shale
The Missouri Mountain Shale is a Silurian geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892,[4] this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas.[2][3] Purdue assigned the Missouri Mountains in Polk and Montgomery counties, Arkansas as the type locality, but did not designate a stratotype. As of 2017, a reference section for this unit has yet to be designated.
| Missouri Mountain Shale | |
|---|---|
| Stratigraphic range: Silurian | |
| Type | Formation |
| Unit of | none |
| Sub-units | none |
| Underlies | Arkansas Novaculite |
| Overlies | Blaylock Sandstone |
| Thickness | up to 300 feet[1] |
| Lithology | |
| Primary | Shale |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Missouri Mountains, Polk County and Montgomery County, Arkansas |
| Named by | Albert Homer Purdue[2][3] |
References
- McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 21. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-09.
- Purdue, A.H. (1909). Slates of Arkansas. Geological Survey of Arkansas. pp. 30, 35.
- Purdue, A.H. (1909). "Structure and stratigraphy of the Ouachita Ordovician area, Arkansas (abstract)". Bulletin of the Geological Society of America. 19: 556–557.
- Griswold, L.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890. 3.
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