Abstract
Abstract Modern pollen data (394 samples from 98 sites) from north coastal California and eastern Oregon show differences in pollen percentages among the major vegetation regions sampled. Isopoll (contours of pollen percentages) maps for 12 pollen types show the influence of vegetational and non‐vegetational factors in patterns of pollen distribution. Regional patterns correlate between Sequoia sempervirens pollen and coastal redwood forest, Quercus pollen and oak woodlands, Tsuga heterophylla and western hemlock forests, and Picea sitchensis pollen and Sitka spruce forests. Factor analysis of the pollen data synthesizes the pollen rain in the major units of the natural vegetation, and produces distinctive pollen signatures (groups of covarying pollen types) for regional vegetational units, ranging from lowlying coastal redwood forests and oak woodlands through mixed evergreen forests, montane forests and alpine environments of the Coast Range and Cascade Mountains.
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