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The Mississippian Borden Formation is a mapped bedrock unit in Kentucky, Indiana, Illinois, Ohio, West Virginia,〔Matchen, D.L., and Kammer, T.W., 1994, Sequence stratigraphy of the Lower Mississippian Price and Borden Formations in southern West Virginia and eastern Kentucky: Southeastern Geology, v. 34, no. 1, p. 25–41.〕 and Tennessee. It has many members, which has led some geologists to consider it a group (for example in Indiana〔Shaver, R.H., Burger, A.M., Gates, G.R., Gray, H.H., and others, 1970, Compendium of rock-unit stratigraphy in Indiana: Indiana Geological Survey Bulletin, no. 43, 229 p.〕) rather than a formation (for example in Kentucky〔Kepferle, R.C., 1971, Members of the Borden Formation (Mississippian) in north-central Kentucky, IN Contributions to stratigraphy, 1971: U.S. Geological Survey Bulletin, 1354-B, p. B1–B18.〕〔Weir, G.W., Gualtieri, J.L., and Schlanger, S.O., 1966, Borden Formation (Mississippian) in south- and southeast-central Kentucky, IN Contributions to stratigraphy, 1965: U.S. Geological Survey Bulletin, 1224-F, p. F1–F38. ()〕). ==Fossils== *Scyphozoans: ''Conularia'' sp. (from Borden Formation), ''Paraconularia'' sp. (from Coral Ridge Member, New Providence Shale)〔http://www.kyanageo.org/mississippian.html KYANA Geological Society (Mississippian)〕 *Hexactinellid Sponges (from Muldraugh Formation)〔 *Brachiopods: ''Orthotetes keokuk'' (from Borden Formation), ''Orbiculoidea'' (from Coral Ridge Member, New Providence Shale)〔 *Trilobite: ''Phillibole conkini'' (Coral Ridge Member, New Providence Formation, Borden Group)〔 *Cephalopods: ''Cantabricanites greenei'', ''Polaricyclus ballardensis'', ''Winchelloceras knappi'' (all from Coral Ridge Member, New Providence Formation, Borden Group),〔 ''Muenstroceras oweni'', ''M. parallelum'', ''Kazakhstania colubrella'', ''Imitoceras ixion'', ''Masonoceras kentuckiense'', ''Merocanites drostei'', ''Dzhaprakoceras'' sp., ''Polaricyclus bordenensis'', ''Winchelloceras allei'' (all from Nada and Cowbell Members)〔David M. Work and Charles E. Mason. 2003. Mississippian (Middle Osagean) Ammonoids from the Nada Member of the Borden Formation, Kentucky, Journal of Paleontology, Vol. 77, No. 3 (May, 2003), pp. 593-596 ()〕 *Crinoids: ''Pachyocrinus aequalis'' (from Muldraugh Mbr.),〔 ''Gilmocrinus kentuckyensis'' (from Muldraugh Mbr.),〔Kammer, T.W. , W. I. Ausich, and A. Goldstein. 2007. ''Gilmocrinus kentuckyensis'' n. sp. from the late Osgean (Mississippian) Muldraugh Member of the Borden Formation in Kentucky: a European immigrant originally derived from North America? Journal of Paleontology, 81:209-212. ()〕 ''Rhodocrinites barrisi divergens'', ''Gilbertsocrinus tuberculosus'', ''Gilbertsocrinus typus'', ''Actinocrinites eximius'', ''Actinocrinites scitulus'', ''Blairocrinus protuberatus'', ''Steganocrinus'', ''Uperocrinus pyriformis'', ''Uperocrinus acuminatus'', ''Eretmocrinus cloelia'', ''Macrocrinus konincki'', ''Dorycrinus quinquelobus'', ''Aorocrinus nodulus'', ''Agaricocrinus planoconvexus'', ''Agaricocrinus inflatus'', ''Dichocrinuspocillum Dichocrinus'', ''Paradichocrinus liratus'', ''Platycrinites glyptus'', ''Platycrinites planus'', ''Platycrinities spinifer'', ''Cyathocrinites iowensis'', ''Barycrinus spurious'', ''Costalocrinus cornutus'', ''Meniscocrinus'', ''Pellecrinus obuncus'', ''Atelestocrinus kentuckyensis'', ''Holcocrinus spinobrachiatus'', ''Blothrocrinus swallovi'', ''Coeliocrinus subspinosus'', ''Decadocrinus scalaris'', ''Taxocrinus'', ''Synbathocrinus dentatus'', ''Halysiocrinus dactylus'' (from Nada Mbr.).〔Lee, K.G., W.I. Ausich, and T.W. Kammer. 2005. Crinoids from the Nada Member of the Borden Formation (Lower Mississippian) in eastern Kentucky. Journal of Paleontology, 79:337-355. ()〕 *Blastoids: ''Granatocrinus kentuckyensis'' (from New Providence Shale)〔 A rare soft-bodied fossil that was recovered from the Farmers Member of the Borden Formation in northeastern Kentucky was interpreted as a chondrophorine float (an internal anatomical feature).〔Ellis L. Yochelson and Charles E. Mason. 1986. A Chondrophorine Coelenterate from the Borden Formation (Lower Mississippian) of Kentucky, Journal of Paleontology, Vol. 60, No. 5 (Sep., 1986), pp. 1025-1028 ()〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Borden Formation」の詳細全文を読む スポンサード リンク
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