Analyses of fossil pollen and beetles from a late Pinedale peat deposit from the upper Fraser River, Colorado, allow a reassessment of previously published paleoenvironmental evidence from the site. Between 13,800 and at least 12,600 yr B.P., the environment was an open tundra indicative of a cold, dry climate. Scattered spruce trees were probably present at the site by the end of the record, ca. 12,300 yr B.P.

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