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Analyses of pollen and spore distribution in samples taken in close stratigraphic succession from several sections of the Neogene Succor Creek, Stinking Water, and Trapper Creek floras indicate that the source-vegetation mosaic at each site was in a state of ecological disequilibrium. All these floras are preserved in volcaniclastic sediments, and in each case the presence of fossiliferous strata is closely linked in both space and time with local eruptive activity. The exposed stratigraphic sections appear to represent relatively short periods of time, probably less than 10,000 yr, excluding unrecognized diastems. In all cases, most of the time represented in...

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