Pollen and spore counts, influx rates and concentrations at DSDP Hole 64-480

Preliminary analyses of 56 samples from the upper 49 meters of Hole 480 (Cores 1-11) show marked changes in pollen frequencies and concentrations. The largely varved cores (1,...对取自480号钻孔（岩芯1-11）上部49米的56个样品所开展的初步分析显示，花粉频率与浓度存在显著变化。以纹层发育为主的岩芯（1,...