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ABSTRACT. We have developed and tested a practical device for manually separating pollen from pollen concentrates in sufficient quantity for AMS "C dating. It is a combination of standard, commercially available equipment handled in a clean room by an individual trained to recognize pollen. A typical example requires about 15-20 h of hand-picking under the microscope. We show the usefulness of this procedure with results on a mid-Holocene segment from a core from Mono Lake. Sediments from this hardwater lake contain pollen and finely disseminated organic matter, but no macrofossils. The pollen dated ca. 1000 yr younger than the bulk sediment. The sediment "date" is most likely affected by incorporation of limestone-derived carbon, and is erroneously old.

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