Calcareous nannoplankton from the Southwest Pacific Ocean

The positions of all cores recovered during Leg 90 in the southwest Pacific are shown within the standard calcareous nannoplankton zonation. The stratigraphic and regional occurrences and preservation of Paleogene calcareous nannoplankton found at Sites 588, 592, and 593 are discussed, and fossil lists are given for selected samples. Data on the Eocene/Oligocene boundary found in Holes 592 and 593 and on the Oligocene/Miocene boundary in Hole 588C are presented. Regional unconformities are noted in Hole 588C, where the upper Eocene to middle Oligocene interval (Zones NP17 to NP23) is missing, and in Hole 592, in which the middle Oligocene to lowest Miocene interval (Zones NP23 to NN1) is not represented.

在西南太平洋的Leg 90航次中恢复的所有核心位置均展示于标准的钙质浮游有孔虫带区。针对位于588、592和593号站点的白垩纪钙质浮游有孔虫的地层学和区域分布以及保存状况进行了讨论，并提供了选定样本的化石名录。在592号和593号钻孔中发现的古新统/始新统界线数据，以及在588C号钻孔中发现的始新统中晚期至渐新统中晚期界线（NP17至NP23带）数据得以呈现。在588C号钻孔中，上始新统至中渐新统区间（NP17至NP23带）存在缺失，而在592号钻孔中，中渐新统至最低中新统区间（NP23至NN1带）亦未得到代表。