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Callipterid peltasperms of the Dunkard Group, Central Appalachian Basin

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dc.contributor.author DiMichele, William A. en
dc.contributor.author Kerp, Hans en
dc.contributor.author Sirmons, Roberta en
dc.contributor.author Fedorko, Nick en
dc.contributor.author Skema, Viktoras en
dc.contributor.author Blake, Bascombe M., Jr. en
dc.contributor.author Cecil, C. B. en
dc.date.accessioned 2014-02-24T20:30:11Z
dc.date.available 2014-02-24T20:30:11Z
dc.date.issued 2013
dc.identifier.citation DiMichele, William A., Kerp, Hans, Sirmons, Roberta, Fedorko, Nick, Skema, Viktoras, Blake, Bascombe M., Jr., and Cecil, C. B. 2013. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F21837">Callipterid peltasperms of the Dunkard Group, Central Appalachian Basin</a>." <em>International Journal of Coal Geology</em>. 119:56&ndash;78. <a href="https://doi.org/10.1016/j.coal.2013.07.025">https://doi.org/10.1016/j.coal.2013.07.025</a> en
dc.identifier.issn 0166-5162
dc.identifier.uri http://hdl.handle.net/10088/21837
dc.description.abstract Abstract The Dunkard Group is the youngest late Paleozoic rock unit in the Central Appalachian Basin. Its age, however, remains controversial. In its southern and western two-thirds the Dunkard is comprised largely of red beds, sandstone and siltstone channel deposits and paleosols. In its thickest, most northerly exposures, in southwestern Pennsylvania, northern West Virginia, and east-central Ohio, much of the lower part of the unit is composed of coals, non-marine limestones and gray, often calcareous, paleosols. Age dating is confounded by the non-marine nature of the deposit and by the lack of dateable volcanic ash beds. Dunkard fossils include plants, vertebrates, and both aquatic and terrestrial invertebrates. Most of the fossil groups point to an age very close to, if not including, the Pennsylvanian-Permian boundary, though the exact position of that boundary is uncertain. Callipterids make their first appearance in the Dunkard flora in the middle of the Washington Formation and continue into the Greene Formation, but in different beds from those containing wetland floral elements. Publication of these plants in the "Permian Flora" of Fontaine and White (1880) created an immediate controversy about the age of the unit because Callipteris conferta (now Autunia conferta) was, at the time, considered to be an index fossil for the base of the Permian. Subsequent collecting has revealed these callipterds to comprise four species: Autunia conferta, Autunia naumannii, Lodevia oxydata and Rhachiphyllum schenkii. Callipterids and the conifers with which they are sometimes associated are typically found in seasonally dry equatorial environments and most likely constitute an environmentally controlled biofacies. This biofacies is not well known, resulting in limited biostratigraphic utility. en
dc.relation.ispartof International Journal of Coal Geology en
dc.title Callipterid peltasperms of the Dunkard Group, Central Appalachian Basin en
dc.type Journal Article en
dc.identifier.srbnumber 116681
dc.identifier.doi 10.1016/j.coal.2013.07.025
rft.jtitle International Journal of Coal Geology
rft.volume 119
rft.spage 56
rft.epage 78
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 56
dc.citation.epage 78


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