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This paper deals with a recent summary of calcareous nannofossil biostratigraphy and an example of biostratigraphic application. According to recent studies of nannofossil biostratigraphy, a total of 60 calcareous nannofossil datums and bioevents can be available for the Neogene and Quaternary. Newly proposed bioevents based on size variations of Reticulofenestra coccoliths are introduced.Calcareous nannofossils in the exploratory wells in offshore Joban were examined and two major hiatuses were identified in the Miocene sequences, indicating relative sea level drops during the Neogene.

sekiyu gijutsu kyokaishi/sekiyu gijutsu kyoukaishi

Recent development of calcareous nannofossil biostratigraphy and its application. Neogene and Quaternary stratigraphy of offshore Joban based on calcareous nannofossils.