Abstract
Analysis of pollen recovered from mineral-rich glaciolacustrine sediments indicates hydrodynamic sorting of grains occurred before final deposition. Percentages of nonarboreal pollen are greatest in fine deltaic sands. Arboreal pollen is preferentially concentrated in lacustrine silt and clay. Similar results have been reported from studies of fluvial and estuarine sediments and from laboratory experiments. The most important result of this study is the demonstration of effective sorting of arboreal pollen. Spruce (Picea) occurs most abundantly in coarse silts, and alder (Alnus) is most abundant in fine silts and clays. These observations suggest that caution should be exercised in the paleoecologic interpretation of pollen spectra obtained from mineral-rich lacustrine sediments.
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