关键词: 珠江口盆地, 第三系, 渐新世, 更新世, 超微古生物学, 化石, 生物地层对比, 地层划分

Abstract: 28 nannofossil bio-events and 20 zones in Oligocene-Pleistocene in the Pearl River Mouth Basin are recognized,the relationship between these bioevents and zones and 6lithostratigraphic units(formation) in the area has been defined in this paper as follows:The top of Wanshan Formation coincides with LAD Discoaster brouweri at top NN18 zone;The top of Yuehai F.with LAD Discoaster quinqueramus at top of NNll zone;The top ofHanjiang F.with LAD Discoaster hamatus at the top of NN9 zone;The top of Zhujiang F.with LAD Helicosphaera ampliaperta at the top of NN4 zone;The top of Zhuhai F.withLAD Dictyococcites bisectus within NNl zone and the top of Enping F.falls in the NP24-NP23 combined zone.This paper suggests that the top of lithostratigraphic Zhuhai Formation and biostratigraphic LAD of Dictyococcites bisectus can be considered as the Paleogene-Neogene boundary and Oligocene-Miocene boundary in the PRM Basin.