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{{Infobox rockunit
| name           = Brassfield Formation
| image          = BrassfieldOutcrop042112.jpg
| caption        = Brassfield Formation exposed in Oakes Quarry near [[Fairborn, Ohio]].    
| type           = Sedimentary
| age            = [[Rhuddanian]] - [[Telychian]]<ref>[https://www.researchgate.net/profile/Frank_Ettensohn/publication/281392122_The_Silurian_of_central_Kentucky_USA_Stratigraphy_palaeoenvironments_and_palaeoecology/links/55e9bcc508ae21d099c327df.pdf The  Silurian  of  central  Kentucky,  U.S.A.:  Stratigraphy, palaeoenvironments and palaeoecology]</ref>{{Fossil range|439|436|Early [[Silurian]]}}
| period         = Silurian
| prilithology   = [[Limestone]]
| otherlithology = [[Dolomite (rock)|dolomite]]
| namedfor       = Brassfield, Kentucky
| namedby        = [[August Foerste|August Frederick Foerste]] (1906, p. 18, 27)<ref name = Foerste1906/>
| region         = East-central USA
| country        = United States
| coordinates    =
| unitof         = 
| subunits       = 
| underlies      = [[Crab Orchard Formation]], [[Dayton Formation]], [[Osgood Formation]], [[Salamonie Dolomite]], and [[St. Clair Limestone]]
| overlies       = [[Brainard Shale]], [[Cason Shale]], [[Drakes Formation]], and [[Whitewater Formation]]
| thickness      = 
| extent         = [[Arkansas]], [[Indiana]], [[Kentucky]], [[Ohio]], and [[Tennessee]]
| area           =
| map            =
| map_caption    =
}}

The '''Brassfield Formation''', named by A.F. Foerste in 1906, is a [[limestone]] and [[Dolomite (rock)|dolomite]] formation exposed in Arkansas,<ref>{{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|pages=7–8|url=http://geology.ar.gov/pdf/IC-36_v.pdf|access-date=2018-01-11|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> Ohio, Kentucky, Indiana, Tennessee and West Virginia in the United States.<ref name=Foerste1906>Foerste, A.F. 1906. The Silurian, Devonian, and Irvine formations of east-central Kentucky, with an account of their clays and limestones. ''Geological Survey of Kentucky, Bulletin'' 7, 369 p.</ref> It is Early [[Silurian]] (Aeronian, Llandoverian) in age and well known for its abundant [[echinoderm]]s, [[coral]]s and [[Stromatoporoidea|stromatoporoids]].<ref name=SchneiderAusich2002.>Schneider, K.A. and Ausich, W.I. 2002. Paleoecology of framebuilders in Early Silurian reefs (Brassfield Formation, southwestern Ohio). ''Palaios'' 17: 237-248.</ref>  In Ohio, where the unit has escaped [[dolomitization]], the Brassfield is an [[encrinite]] [[Biosparite limestone|biosparite]] with numerous [[crinoid]] species.<ref name=Ausich1984.>Ausich, W.I. 1984. Calceocrinids from the Early Silurian (Llandoverian) Brassfield Formation of southwestern Ohio. ''Journal of Paleontology'' 58: 1167-1185.</ref><ref name=Coogan1996.>Coogan, A.H. 1996. Ohio's surface rocks and sediments, in Feldmann, R.M., and Hackathorn, M., eds., ''Fossils of Ohio: Ohio Department of Natural Resources, Division of Geological Survey Bulletin'' 70: 31–50.</ref>
<gallery>
File:BrassfieldEncrinite042112.jpg|Close view of Brassfield Formation near Fairborn, Ohio, showing grains mainly composed of crinoid fragments.
File:Phaenopora superba Silurian Brassfield.jpeg|''Phaenopora superba'', a [[bryozoa]]n from the Brassfield Formation.
File:BrassfieldEncrinite041915.JPG|Encrinite from the Brassfield Formation (Silurian) near Fairborn, Ohio.
</gallery>

==References==
{{reflist}}

{{Chronostratigraphy of Indiana}}
{{Chronostratigraphy of Kentucky}}
{{Chronostratigraphy of Ohio}}

[[Category:Silurian System of North America]]
[[Category:Silurian Arkansas]]
[[Category:Silurian Indiana]]
[[Category:Silurian Kentucky]]
[[Category:Geologic formations of Ohio]]
[[Category:Geologic formations of Tennessee]]
[[Category:Geologic formations of West Virginia]]
[[Category:Silurian southern paleotemperate deposits]]
[[Category:Rhuddanian]]
[[Category:Aeronian]]
[[Category:Telychian]]


{{US-geologic-formation-stub}}

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