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Upper Pennsylvanian Compression Floras of the 7-11 Mine, Columbiana County, Northeastern Ohio

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/23238

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dc.creator McComas, Melissa A. en_US
dc.date.accessioned 2006-07-07T02:24:51Z
dc.date.available 2006-07-07T02:24:51Z
dc.date.issued 1988-03 en_US
dc.identifier.citation The Ohio Journal of Science. v88, n1 (March, 1988), 48-52 en_US
dc.identifier.issn 0030-0950 en_US
dc.identifier.uri http://hdl.handle.net/1811/23238
dc.description Author Institution: Department of Botany, Ohio University en_US
dc.description.abstract Two compression floras have been discovered below the Brush Creek marine unit (lower Conemaugh) in Columbiana County, Ohio. One flora is preserved in freshwater ironstone beds 6 m below the Brush Creek and contains abundant pteridosperm and sphenopsid elements. The assemblage includes Sphenophyllum oblongifolium, Pecopteris candolleana, Danaeites emersonii and Odontopteris brardii, taxa previously recorded from younger strata. The second assemblage occurs within a 1.5-m-thick argillaceous, freshwater shale directly below the Brush Creek and yields abundant lycopod, cordaite, and conifer remains. The latter elements, some of which are permineralized with pyrite, represent the earliest occurrence of conifers in the eastern United States known to date. en_US
dc.format.extent 2239312 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.title Upper Pennsylvanian Compression Floras of the 7-11 Mine, Columbiana County, Northeastern Ohio en_US