沖縄本島南部における上部新生界微化石層序 : 第 1 部.石灰質超微化石分帯, 及び浮遊性有孔虫化石帯との対比

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The present investigation attempts to establish a standard biostratigraphic sequence by means of calcareous nannoplanktons and planktonic foraminifera for the Shimajiri Group and overlying Chinen Formation, which are well developed in the southern Okinawa-jima region, using 20 well-core samples and 52 surface samples. It results in the recognition of eight calcareous nannofossil datum planes from the CN9a through CN13a Zones in OKADA and BUKRY'S (1980) scheme and of eight planktonic foraminiferal datum planes, aside from two coiling-change data of Pulleniatina species, from the N16 through N22 Zones in BLOW'S (1960) shceme. Through this upper Miocene to lower Pleistocene sequence, the stratigraphic positions of both kinds of datum planes are agreably located from each other, particularly when their calibrated ages are considered. It is also suggested that the geographic tracing of some planktonic foraminiferal datum planes is much useful for further study of geological structure of the Shimajiri Group. Standard microbiostratigraphic scale proposed here may offer us more reliable and detailed procedures for such an advanced geological investigation. On the basis of field observation and laboratory work, an unconformable relationship is conclusively estimated between the Shimajiri Group and the Chinen Formation of the Ryukyu Group. During the time gap between the two groups, a movement might have caused the tectonic feature of the present-day Ryukyu Arc System.
国立科学博物館の論文
1984-12-22

沖縄本島南部における上部新生界微化石層序 : 第 1 部.石灰質超微化石分帯, 及び浮遊性有孔虫化石帯との対比

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