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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. White, D. (1933). Some features of the Early Permian flora of North America, 16th International Geological Congress 1, 679-689. Willard, D. A. (1989). Source plants for Carboniferous microspores: Lycospora from permineralized Lepidostrobus , American Journal of Botany 76, 820-827. Willard, D. A. (1993). Vegetational patterns in the Springfield Coal (Middle Pennsylvanian; Illinois Basin): Comparison of miospore and coal-ball records, in Modern and Ancient Coal-Forming Environments, J. C. Cobb and C. B. Cecil, eds., Geological Society of America Special Paper 286, Boulder, Colo., pp. 139-152. Willard, D. A., and T. L. Phillips (1993). Paleobotany and palynology of the Bristol Hill Coal Member (Bond Formation) and Friendsville Coal Member (Mattoon Formation) of the Illinois Basin (upper Pennsylvania), Palaios 8, 574-586. Wing, S. L. (1988). Taxon-free paleoecological analysis of Eocene megafloras from Wyoming, American Journal of Botany 75 (6-part 2), 120 (Abstract). Wing, S. L., and B. H. Tiffney (1987). The reciprocal interaction of angiosperm evolution and tetrapod herbivory, Review of Palaeobotany and Palynology 50, 179-210. Winston, R. B., and R. W. Stanton (1989). Plants, coal, and climate in the Pennsylvanian of the central Appalachians, in Carboniferous Geology of the Eastern United States, 28th International Geological Congress, Field Trip Guidebook T143, pp. 118-126. Wnuk, C. (1985). The ontogeny and paleoecology of Lepidodendron rimosum and Lepidodendron bretonense trees from the middle Pennsylvanian of the Bernice Basin, Sullivan County, Pennsylvania, Palaeontographica 195B, 153-181. Wnuk, C., and H. W. Pfefferkorn (1987). A Pennsylvanian-age terrestrial storm deposit: Using plant fossils to characterize the history and process of sediment accumulation, Journal of Sedimentary Petrology 57, 212-221. Wolfe, J. A., and G. R. Upchurch (1986). Vegetation, climatic and floral changes at the Cretaceous-Tertiary boundary, Nature 324, 148-152. Ziegler, A. M. (1990). Phytogeographic patterns and continental configurations during the Permian Period, in Palaeozoic Palaeogeography and Biogeography, W. S. McKerrow and C. R. Scotese, eds., Geological Society of London Memoir, pp. 363-379. Ziegler, A. M., R. K. Bambach, J. T. Parrish, S. F. Barrett, E. H. Gierlowski, W. C. Parker, A. Raymond, and J. J. Sepkoski (1981). Paleozoic biogeography and climatology, in Paleobotany, Paleoecology and Evolution, Volume 2, K.J. Niklas, ed., Praeger, New York, pp. 231-266.
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