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Mazarn Shale
Stratigraphic range: Ordovician
Type Formation
Unit ofnone
Sub-unitsnone
Underlies Blakely Sandstone
Overlies Crystal Mountain Sandstone
Thickness1000 to 2500+ feet [1]
Lithology
Primary Shale
Location
Region Arkansas, Oklahoma
Country United States
Type section
Named forMazarn Creek, Montgomery County, Arkansas
Named byHugh 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

Graptolites

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]

See also

References

  1. ^ 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.
  2. ^ a b Miser, H.D. (1918). "Manganese deposits of the Caddo Gap and De Queen quadrangles, Arkansas". U.S. Geological Survey Bulletin. 660-C: 68.
  3. ^ Griswold, I.S. (1892). "Whetstones and the novaculites". Annual Report of the Geological Survey of Arkansas for 1890. 3.
  4. ^ a b c d e f g h i j k l m n o p q r s 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.
  5. ^ a b 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.