AMS RADIOCARBON DATING OF ANNUALLY LAMINATED SEDIMENTS FROM LAKE HOLZMAAR, GERMANY

AMS radiocarbon ages have been determined on terrestrial macrofossils selected from the annually laminated sediments of lake Holzmaar (Germa ny). The radiocarbon chronology of this lake covers the last 12.6 ka. Comparison of the radiocarbon dated varve chronology with tree ring da ta shows that an additional 878 years have to be added to the varve ch ronology. The corrected C-14 varve chronology of Holzmaar reaches back to ca. 13.8 ka cal. BP and compares favourably with the results from Soppensee (Switzerland) (Hajdas et al., 1993). The corrected ages for the onset and the end of the Younger Dryas biozone are 11,940 cal. BP and 11,490 cal. BP, respectively. The ash layer of the Laacher See vol canic eruption is dated at 12,201 +/- 224 cal. BP and the Ulmener Teph ra layer is dated at 10,904 cal. BP.