(Table 1) Ages of planktonic foraminiferal datums at Leg 94 Sites

The six Leg 94 sites have produced a unique data set from a north-south transect of sites, all with good paleomagnetic records, and all but one with above-average accumulation rates. We show that it is necessary to have high accumulation rates to obtain good quality magnetobiostratigraphies, and that it is difficult to correlate geological sequences over distances of several hundred kilometers without independent age control. Using the paleomagnetically derived ages for species ranges, we show several examples of diachronic first and last appearance datums between the core sites. This has enabled us to test the existing zonal schemes for the Pliocene-Pleistocene and to identify new zonal markers.

第94航次（Leg 94）的6个站位获取了一套独特的南北向剖面站位数据集，所有站位均具备优质的古地磁记录（paleomagnetic records），且除1个站位外，其余站位的沉积物堆积速率均高于平均水平。研究表明，要获得高质量的磁生物地层学（magnetobiostratigraphy）结果，必须具备较高的沉积物堆积速率；且在缺乏独立年代约束（independent age control）的情况下，难以对数百公里范围内的地质地层序列进行对比。借助古地磁定年推导得到的物种分布年代数据，我们展示了核心站位之间多个穿时首现基准面（first appearance datum）与穿时末现基准面（last appearance datum）的实例。这一成果使得我们能够检验现有上新世-更新世地层分带方案，并识别出新的地层分带标志。