Abstract
Abstract The ranges of twenty selected species of palynomorphs define the palynostratigraphic framework of Cretaceous strata of the central overthrust belt of the Rocky Mountains. The palynostratigraphy is based on local ranges of dinocysts, spores, and pollen determined from more than 300 samples from independently dated outcrop reference sections in Fossil Basin, southwestern Wyoming. The stratigraphic succession in Fossil Basin is essentially continuous from middle Albian to upper Maestrichtian, except for a hiatus in the Campanian, and includes about 4500 meters of marine and nonmarine rocks. The most reliable biostratigraphic zonation for the region is one based on local ranges of palynomorphs. Use of both marine and nonmarine palynomorphs not only permits correlation between facies, but also can refine zonation of the total interval. Ratios of marine to nonmarine palynomorphs in the interval studied show a pattern that represents transgression and regression of the Western Interior Cretaceous seaway...
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