(Table 1) Stratigraphic distribution and abundances of Cretaceous radiolarians from ODP Holes 130-803D and 130-807C

Among the five sites drilled during Ocean Drilling Program Leg 130, two deep holes (8O3D and 807C) penetrated Cretaceous sediments overlying the basaltic pillows, flows, and possibly basement rocks. Abundant, poorly preserved radiolarians with limited diversity were recovered from a few horizons within the sediments proximal to the basalt. At Site 803, three thin layers of radiolarites interbedded with claystone and clayey siltstone yielded radiolarian assemblages of late Albian age. At Site 807, several layers of radiolarian siltstones were recovered proximal to the basalt. Among them the most significant radiolarian assemblage is an Aptian fauna, located approximately 7 m above the basaltic flows. The Aptian radiolarian age for Site 807 is at least in accord with those suggested by planktonic foraminifer and paleomagnetic evidence. These Cretaceous radiolarians are the oldest assemblages recorded from the Ontong Java Plateau region.

在大洋钻探计划（Ocean Drilling Program, ODP）第130航次所钻探的5个站位中，2个深钻孔（8O3D与807C）钻穿了覆盖于玄武岩枕状熔岩、熔岩流乃至可能的基底岩石之上的白垩纪沉积物。在紧邻玄武岩的沉积物的少量地层位中，采获了丰富但保存状态较差、多样性有限的放射虫（radiolarians）。在803站位，3层与黏土岩（claystone）及黏土质粉砂岩（clayey siltstone）互层的薄层放射虫岩（radiolarites）产出了阿尔布晚期（late Albian）的放射虫组合。在807站位，紧邻玄武岩的区域采获了多层放射虫粉砂岩，其中最具科研意义的放射虫组合为阿普第期（Aptian）动物群，其赋存层位距玄武岩熔岩流上方约7米。807站位的阿普第期放射虫年代学结果，至少与浮游有孔虫（planktonic foraminifer）及古地磁证据所提出的年代结论相符。该批白垩纪放射虫组合是翁通爪哇海台（Ontong Java Plateau）区域目前记录到的最古老放射虫化石组合。