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In the last 25 years, many paleobotanists and palynologists have focused on the paleoflora of the Catskill clastic wedge, to take advantage of the sequence of abundant floral remains. In this interim a considerable body of paleobotanical information has accrued. It is clear now that these fossil plants are not a localized paleoflora. At the generic level many of them are to be found in Europe, Siberia, China, Australia and, less commonly, in Africa. Most of these genera are of the plant lineages that give rise to the dominant floras of the Carboniferous. Unlike most animal megafossils, it is the form and position of the reproductive organs of the plant that have been primarily used in placing the plant in its rightful position in major evolutionary groupings. Yet plant megafossils are mostly found as fragments of the vegetative plant, as leaves, stems and occasionally cellular anatomy. Because of this, it has been only recently that a tentative scheme of sequential megafossil assemblages in the Siluro-Devonian has appeared to augment earlier palynological schemes. Several prolific localities are discussed and one example of exceptional preservation is illustrated. These details show the kind and extent of information obtainable from the Catskill delta deposits, which then give clues to depositional environments and climatic conditions at the time of deposition.

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