Moorefield Formation

{{Short description|Geologic formation in northern Arkansas and eastern Oklahoma}} {{Infobox rockunit | name = Moorefield Formation | image = | caption = | type = Formation | age = Mississippian | period = Mississippian | prilithology = Shale | otherlithology = Limestone | namedfor = Moorefield, Independence County, Arkansas | namedby = George Irving Adams and Edward Oscar Ulrich<ref>{{cite journal|last1=Adams|first1=G.|last2=Ulrich|first2=E.|title=Zinc and lead deposits of northern Arkansas|journal=U.S. Geological Survey Professional Paper|date=1904|volume=24|issue=7|pages=26|doi=10.1086/621186|bibcode=1904JG.....12..663.|doi-access=free}}</ref> | region = Arkansas, Oklahoma | country = United States | coordinates = | unitof = | subunits = Ruddell Shale | underlies = Batesville Formation | overlies = Boone Formation | thickness = up to 300 feet<ref name = McFarland>{{cite journal|last1=McFarland|first1=John David|title=Stratigraphic summary of Arkansas|journal=Arkansas Geological Commission Information Circular|date=2004|orig-year=1998|volume=36|page=11|url=http://geology.ar.gov/pdf/IC-36_v.pdf|access-date=2018-06-01|archive-url=https://web.archive.org/web/20161221195953/http://www.geology.ar.gov/pdf/IC-36_v.pdf|archive-date=2016-12-21|url-status=dead}}</ref> | extent = | area = | map = | map_caption = }}

The '''Moorefield Formation''', or '''Moorefield Shale''', is a geologic formation in northern Arkansas and eastern Oklahoma that dates to the Meramecian Series of the middle Mississippian. In Arkansas, this formation is generally recognized to have one member, the Ruddell Shale, in the upper Moorefield Formation.

==Paleofauna== ===Bryozoans=== *''Archimedes'' :''A. confertus''<ref name="Horowitz">{{cite journal|last1=Horowitz|first1=Alan S.|title=Late Mississippian and Early Pennsylvanian bryozoan faunas of Arkansas and Oklahoma: a review|journal=Oklahoma Geological Survey Guidebook|date=1977|volume=18|pages=101–105|url=http://ogs.ou.edu/docs/guidebooks/GB18.pdf|access-date=3 February 2018}}</ref> :''A. proutanus''<ref name = Horowitz/> *''Batostomella'' :''B. dubla''<ref name = Horowitz/> :''B. parvula''<ref name = Horowitz/> *''Tabulipora''<ref name = Horowitz/>

===Cephalopods=== * ''Adnatoceras''<ref name = gordon>{{cite journal|last1=Gordon|first1=Mackenzie Jr.|title=Carboniferous Cephalopods of Arkansas|journal=U.S. Geological Survey Professional Paper|date=1964|volume=460|pages=14–16}}</ref> : ''A. alaskense''<ref name = gordon/> * ''Bactrites'' : ''B. caronarius''<ref name = gordon/> : ''B. smithianus''<ref name = gordon/> * ''Endolobus'' : ''E. ornatus''<ref name = gordon/> * ''Girtyoceras'' : ''G. welleri''<ref name = gordon/> * ''Goniaties''<ref name = gordon/> * ''Mitorthoceras''<ref name = gordon/>

==See also== {{Portal|Earth sciences|United States|Paleontology}} * List of fossiliferous stratigraphic units in Arkansas * Paleontology in Arkansas

==References== {{reflist}} * {{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= ((Various Contributors to the Paleobiology Database))|url= https://www.fossilworks.org|access-date= 17 December 2021}}

Category:Mississippian Oklahoma Category:Mississippian Arkansas Category:Carboniferous southern paleotropical deposits Category:Shale formations of the United States Category:Limestone formations of the United States Category:Geologic formations of Arkansas Category:Geologic formations of Oklahoma