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] |
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.