Mazarn Shale

Mazarn Shale
Stratigraphic range: Ordovician
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]

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]

Paleofauna

C. wrighti[4]

C. antennarius[4]

D. caduceus[4]

D. caduceus nana[4]

D. extensus[4][5]

D. filiformis[4]

D. nitidus[4]

D. similis[4]

G. hystrix[4]

P. typus[4]

T. clarkei[4]

T. fruticosus[4]

T. quadribrachiatus[4]

T. pendens[4]

T. serra[4]

T. similis[4]

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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