Abstract
Rapid and drastic changes in radiolarian assemblages during the last 33 kyr were revealed in three sediment cores from the eastern and northeastern Japan Sea. Such changes occurred synchronously over the Sea according to the correlation by TL layers and AMS14C dating. On the basis of these bio-events, four radiolarian biozones were established : Ceratospyris borealis Interval Biozone (33 to 1514C kyr BP), Stylochlamydium venustum Interval Biozone (15 to 1214C kyr BP), Cycladophora davisiana Interval Biozone (12 to 10.514C kyr BP), and Larcopyle butschlii Interval Biozone (10.514C kyr BP to Present) . These radiolarian biozones are useful for correlating the upper Quaternary sediments in the Japan Sea, where carbonate fossils are poorly preserved below the calcium carbonate compensation depth (CCD) .
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