Mazarn Shale Explained

Mazarn Shale
Type:	Formation
Age:	Ordovician
Prilithology:	Shale
Namedfor:	Mazarn Creek, Montgomery County, Arkansas
Namedby:	Hugh Dinsmore Miser^[1]
Region:	Arkansas, Oklahoma
Country:	United States
Unitof:	none
Subunits:	none
Underlies:	Blakely Sandstone
Overlies:	Crystal Mountain Sandstone
Thickness:	1000 to 2500+ feet^[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.^[1]

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]

Miser. H.D.. Manganese deposits of the Caddo Gap and De Queen quadrangles, Arkansas. U.S. Geological Survey Bulletin. 1918. 660-C. 68.
McFarland. John David. Stratigraphic summary of Arkansas. Arkansas Geological Commission Information Circular. 2004. 1998. 36. 18. 2018-01-08. https://web.archive.org/web/20161221195953/http://www.geology.ar.gov/pdf/IC-36_v.pdf. 2016-12-21. dead.
Griswold. I.S.. Whetstones and the novaculites. Annual Report of the Geological Survey of Arkansas for 1890. 1892. 3.
Miser. Hugh D.. Purdue. A.H.. Geology of the De Queen and Caddo Gap quadrangles, Arkansas. U.S. Geological Survey Bulletin. 1929. 808. 27–28.
Pitt. William D.. Cohoon. Richard R.. Lee. Harry C.. Robb. Marion G. Watson. John. Ouachita Mountain core area, Montgomery County, Arkansas. Bulletin of the American Association of Petroleum Geologists. January 1961. 45. 1. 79–80. 8 January 2018.