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A calendar age estimate of the Younger Dryas-Holocene boundary at Kråkenes, western Norway
Steinar Gulliksen
Radiological Dating Laboratory, NTNU, Sem S{landsvei 5, N-7034 Trondheim, Norway
Hilary H. Birks
Botanical Institute, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
Göran Possnert
Tandem Laboratory, University of Uppsala, Box 533, S-751 21 Uppsala, Sweden
Jan Mangerud
Department of Geology, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
The Younger Dryas/Holocene transition (YD/H) in the sediments of Kråkenes Lake, western Nor way, is well marked both lithologically and palaeobiologically at 756.5 cm in the investigated core. A series of 70 AMS radiocarbon dates on terrestrial plant macrofossils and the NaOH-soluble fraction of lake sediment was measured between 585 and 840 cm, covering the time span c. 10 440 to 7915 BP on the radiocarbon timescale. Forty-three of these dates above 760 cm were wiggle-matched against the German oak-pine dendro calibration curve (IntCal 93) with recent corrections in both the oak and the pine sections. With an increase in age of the pine dendro-series of 200 6 20 yr, the calendar age of the YD/H lithostratigraphic boundary at Kråkenes is estimated to 11 530+40 -60 cal. BP. By using a date of 9750 BP (11 170 cal. BP) on the transition between the 10 000 and 9600 14C plateaux as a time marker, this result is compared with recent results from other archives. It is consistent with many of them, including the GRIP ice core, German pine series, Lake Go ciaz, south Swedish lakes, and Baltic varves, suggesting that the Younger Dryas-Holocene transition in the North Atlantic region occurred within the range 11 500–11 600 cal. BP.
Key Words: AMS radiocarbon dating • radiocarbon calibration • wiggle-matching • Younger Dryas-Holocene transition • lithological boundary • Kråkenes • Norwa cia
The Holocene, Vol. 8, No. 3,
249-259 (1998)
DOI: 10.1191/095968398672301347
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