Five assemblages of dispersed spores and pollen were recognized in the lower Kittanning coal of western Pennsylvania. Evidence is presented for a genetic relationship between the distribution of the assemblages in the coal and the distributions of the overlying facies. Ecological factors assumed to have influenced spore and pollen distribution in the seam include marine transgression, salinity, edaphic conditions, slope and climate. Comparisons of spatial arrangements of the Kittanning assemblages are made with geometric arrangement of modern assemblages in southwestern Florida and similarities are pointed out.

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