Womble Shale
The Womble Shale is a Middle Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892,[3] this unit was not named until 1909 by Albert Homer Purdue in his study of the Ouachita Mountains of Arkansas, where he named this unit as part of the upper Ouachita Shale and the Stringtown Shale.[4] In 1918, U.S. Geological Survey geologist, Hugh Dinsmore Miser, replaced Purdue's nomenclature with the Womble Shale.[2] Miser assigned the town of Womble (now called Norman) in Montgomery County, Arkansas as the type locality. As of 2017, a reference section for this unit has yet to be designated.
| Womble Shale Stratigraphic range: Ordovician | |
|---|---|
| Type | Formation |
| Unit of | none |
| Sub-units | none |
| Underlies | Bigfork Chert |
| Overlies | Blakely Sandstone |
| Thickness | 500 to 1200 feet[1] |
| Lithology | |
| Primary | Shale |
| Location | |
| Region | Arkansas, Oklahoma |
| Country | United States |
| Type section | |
| Named for | Womble, Montgomery County, Arkansas |
| Named by | Hugh Dinsmore Miser[2] |
Paleofauna
Graptolites
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References
- McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 19.
- Miser, H.D. (1918). "Manganese deposits of the Caddo Gap and De Queen quadrangles, Arkansas". U.S. Geological Survey Bulletin. 660-C: 67.
- Griswold, L.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890. 3.
- Purdue, A.H. (1909). Slates of Arkansas. Geological Survey of Arkansas.
- Miser, Hugh D.; Purdue, A.H. (1929). "Geology of the De Queen and Caddo Gap quadrangles, Arkansas". U.S. Geological Survey Bulletin. 808: 33–36.
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