(Tables 3, 4) Age models of ODP Leg 138 sites

The sediments recovered during Leg 138 have provided us with a remarkable opportunity to improve the stratigraphic framework for east-central Pacific Ocean Neogene age sediments. In this chapter, we review some of the data that have been generated and derive best estimates for the ages of potentially useful biostratigraphic datums, within the paleomagnetic temporal framework of Shackleton et al. determined for this volume and also, for comparison, according to the 1985 and 1992 paleomagnetic time scales of Berggren et al. and Cande and Kent, respectively.

大洋钻探航次138所获取的沉积物，为我们优化东太平洋中部新近纪沉积物的地层格架提供了极佳契机。本章将梳理已生成的部分数据，在为本卷确定的Shackleton等人的古地磁年代框架内，推导得到具有潜在应用价值的生物地层标志面（biostratigraphic datums）的最优年龄估算值；同时，为便于对比，本章还将分别采用Berggren等人1985年的古地磁年表以及Cande与Kent1992年的古地磁年表开展相关推导。