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AMS 14C DATING OF POLLEN CONCENTRATE FROM LATE PLEISTOCENE ICE WEDGES FROM THE BISON AND SEYAHA SITES IN SIBERIA
Abstract
Accelerator mass spectrometry (AMS) radiocarbon dates of pollen concentrate were obtained from multistage
syngenetic ice wedges of cross-sections from the Late Pleistocene Bison site, located along the Lower Kolyma River
(6834'N, 15834'E), from ~43,600 to ~26,200 BP, and 3 AMS 14C dates of pollen concentrate in ice wedges from the Seyaha
site cross-section, located on the east coast of the Yamal Peninsula (7010'N, 7234'E), from ~22,400 to ~25,200 BP. Pollen
concentrate samples were prepared using a special pretreatment procedure. Pollen and spores from ice-wedge ice signalize a
regional pollen rain. Therefore, 14C-dated extracts of pollen and spores from ice-wedge ice enable an adequate reconstruction
and chronology of landscape dynamics on a regional scale. The pollen and spores were well preserved despite numerous redepositions
in the penecontemporaneous structure in which they were found. Thus, a comparison with dates on other fractions
from the same sample is necessary. The youngest date is the most reliable among the intersample AMS 14C dates from the ice
and permafrost sediments.
syngenetic ice wedges of cross-sections from the Late Pleistocene Bison site, located along the Lower Kolyma River
(6834'N, 15834'E), from ~43,600 to ~26,200 BP, and 3 AMS 14C dates of pollen concentrate in ice wedges from the Seyaha
site cross-section, located on the east coast of the Yamal Peninsula (7010'N, 7234'E), from ~22,400 to ~25,200 BP. Pollen
concentrate samples were prepared using a special pretreatment procedure. Pollen and spores from ice-wedge ice signalize a
regional pollen rain. Therefore, 14C-dated extracts of pollen and spores from ice-wedge ice enable an adequate reconstruction
and chronology of landscape dynamics on a regional scale. The pollen and spores were well preserved despite numerous redepositions
in the penecontemporaneous structure in which they were found. Thus, a comparison with dates on other fractions
from the same sample is necessary. The youngest date is the most reliable among the intersample AMS 14C dates from the ice
and permafrost sediments.