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Cyclic changes in Pennsylvanian paleoclimate and effects on floristic dynamics in tropical Pangaea

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dc.contributor.author DiMichele, William A. en
dc.contributor.author Cecil, C. Blaine en
dc.contributor.author Montañez, Isabel P. en
dc.contributor.author Falcon-Lang, Howard J. en
dc.date.accessioned 2010-11-22T15:07:39Z
dc.date.available 2010-11-22T15:07:39Z
dc.date.issued 2010
dc.identifier.citation DiMichele, William A., Cecil, C. Blaine, Montañez, Isabel P., and Falcon-Lang, Howard J. 2010. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F11253">Cyclic changes in Pennsylvanian paleoclimate and effects on floristic dynamics in tropical Pangaea</a>." <em>International Journal of Coal Geology</em>. 83 (2-3):329&ndash;344. <a href="https://doi.org/10.1016/j.coal.2010.01.007">https://doi.org/10.1016/j.coal.2010.01.007</a> en
dc.identifier.issn 0166-5162
dc.identifier.uri http://hdl.handle.net/10088/11253
dc.description.abstract Wetland floras narrowly define perceptions of Pennsylvanian tropical ecosystems, the so-called Coal Age. Such wetlands reflect humid-to-perhumid climate, leading to characterizations of Pennsylvanian tropics as everwet, swampy. These views are biased by the high preservation potential of wetlands. Sedimentation patterns, paleosols, and fossil floras indicate the presence of vegetation tolerant of subhumid to dry-subhumid, perhaps semi-arid climate in basins between peat formation times. Understanding the significance of this seasonally-dry vegetation has suffered from conceptual and terminological confusion. A clearer view has emerged as models for framing the data have improved. Basinal floras typical of seasonally dry conditions, relatively low soil moisture regimes, are well documented but mainly from isolated deposits. Some of the earliest, dominated by primitive pteridosperms (&quot;Flözfern&quot; floras), occur in clastic rocks between European Early Pennsylvanian coal beds. Later Early Pennsylvanian, fern-cordaitalean vegetation, different from coal floras, is preserved in marine goniatite bullions. Conifers are first suggested by late Mississippian Potoniesporites pollen . About the same time, in North America, broadleaf foliage, Lesleya and Megalopteris occur in basin-margin settings, on drought-prone limestone substrates. The best known, xeromorphic floras found between coal beds appear in the Middle through Late Pennsylvanian, containing conifers, cordaitaleans, and pteridosperms. The Middle Pennsylvanian appearances of this flora are mainly allochthonous, though parautochthonous occurrences have been reported. Parautochthonous assemblages are mostly Late Pennsylvanian. The conifer flora became dominant in western and central Pangaean equatorial lowlands in earliest Permian. Location of the humid-perhumid wetland flora during periods of relative dryness, though rarely discussed, is as, or more, perplexing than the spatial location of seasonally dry floras through time-wetland plants had few migratory options and possibly survived in small refugia, within and outside of basins. Coupled oscillations in climate, sea level, and vegetation were driven most likely by glacial-interglacial fluctuations, perhaps controlled by orbital cyclicity. en
dc.relation.ispartof International Journal of Coal Geology en
dc.title Cyclic changes in Pennsylvanian paleoclimate and effects on floristic dynamics in tropical Pangaea en
dc.type Journal Article en
dc.identifier.srbnumber 90797
dc.identifier.doi 10.1016/j.coal.2010.01.007
rft.jtitle International Journal of Coal Geology
rft.volume 83
rft.issue 2-3
rft.spage 329
rft.epage 344
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.citation.spage 329
dc.citation.epage 344

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