Miocene Diatom Biostratigraphy of Onshore Sequences on the Pacific Side of Northeast Japan, with Reference to DSDP Hole 438A (Part 2)

概要

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The biostratigraphic distribution of Miocene diatoms in onshore sequences on the Pacific side of Northeast Japan has been investigated with reference to Hole 438A of the Deep Sea Drilling Project. Determination of stratigraphic ranges of diagnostic diatom species enables the establishment of datum levels that are most reliable for a long-distance correlation. Eleven diatom datums are proposed on the basis of the stratigraphic distribution pattern of several species belonging to the genus Denticulopsis. By employing these datums, a composite sequence of Miocene strata is divided biostratigraphically into eleven zones in upward sequence, as follows : The Actinocyclus ingens Zone, Denticulopsis lauta Interval-zone, D. hyalina Interval-zone, D. hustedtii Interval-zone. D. nicobarica Interval-zone. D. praedimorpha Range-zone, Coscinodiscus yabei Interval-zone, D. dimorpha Range-zone, D. katayamae Interval-zone, Thalassionema schraderi Interval-zone, and D. kamtschatica Zone. Onshore sequences have precisely been correlated with DSDP Hole 438A by means of these datum levels and zones proposed herein. Detailed correlation of the proposed zones with those of previous authors leads to a systematic explanation of the diatom biostratigraphy in the northwestern Pacific.
東北大学の論文
1984-10-15