Mazarn Shale
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]
References
- McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 18. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-08.
- Miser, H.D. (1918). "Manganese deposits of the Caddo Gap and De Queen quadrangles, Arkansas". U.S. Geological Survey Bulletin. 660-C: 68.
- Griswold, I.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890. 3.
- Miser, Hugh D.; Purdue, A.H. (1929). "Geology of the De Queen and Caddo Gap quadrangles, Arkansas". U.S. Geological Survey Bulletin. 808: 27–28.
- Pitt, William D.; Cohoon, Richard R.; Lee, Harry C.; Robb, Marion G; Watson, John (January 1961). "Ouachita Mountain core area, Montgomery County, Arkansas". Bulletin of the American Association of Petroleum Geologists. 45 (1): 79–80. Retrieved 8 January 2018.
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