日本新第三系の浮遊性有孔虫生層序,とくに基準となるdatum planesについて

概要

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Thirteen planktonic foraminiferal datum planes were chosen for intra- as well as interregional correlation of the Neogene strata of Japan. The datum planes are, in ascending order: Globigerinoides datum, Globigerinatella insueta datum, Globigerinita dissimilis/Globigerinita unicava (top) datum, Globigerinoides sicanus datum, Praeorbulina datum, Orbulina datum, Globorotalia fohsi fohsi (sensu BOLLI) datum, Globigerina nepenthes datum, Globorotalia siakensis (top) datum, Globorotalia acostaensis datum, Pulleniatina datum, Sphaeroidinella dehiscens datum, and Globorotalia truncatulinoides datum. Based upon these datum planes the sequences typical of various sedimentary basins were arranged in stratigraphic and geographic order. To determine the stratigraphic range of the planktonic foraminifera, the faunas from each sequence were examined in terms of the datum planes. The datum planes, stratigraphic change in faunal composition, and concurrence of characteristic taxa provided a sound basis for both intra- and interregional correlation as shown in Fig. 2. Further desired is, 1) stratigraphical positioning of the Globigerinoides datum, 2) taxonomic revision of Globorotalia fohsi fohsi (sensu BOLLI) recorded from various areas, and 3) a fine-cut biostratigraphic classification between the Globorotalia fohsi fohsi (sensu BOLLI) datum and the Globorotalia acostaensis datum on the Pacific side of Japan.
日本地質学会の論文
1973-03-31