899. LATE MIDDLE MIOCENE FORAMINIFERA FROM THE MATSUE FORMATION, SHIMANE PREFECTURE

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  • 899. 島根県松江層の中期中新世後期の有孔虫
  • 島根県松江層の中期中新世後期の有孔虫〔英文〕
  • シマネケン マツエソウ ノ チュウキ チュウシンセイ コウキ ノ ユウコウチュ

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Late Middle Miocene benthic foraminifera from the Matsue Formation in northern Shimane Prefecture are described, based on one boring well (depth 300m). Foraminiferal assemblages consist of1 38 taxa, which include Ammonia cf. beccarii, Elphidium izumoense, n. sp., Elphidium matsuense, n. sp., Buliminella elegantissima, Buccella cf. kuromatsunaiensis, Elphidiella praesomaensis, n. sp., Elphidium perforatum, n. sp., Pseudononion japonicum and Trichohyalus sp. A Q-mode principal component analysis reveals that the lower horizon is represented by the E. perforatum, E. praesomaensis, and E. matsuense end-member assemblages and the upper stratigraphic horizon by A. cf. beccarii. These end member assemblages indicate that the Matsue Formation was not only deposited in a shallow-warm water environment but also influenced by a cold water. Generally, the assemblages of the Matsue Formation are closely correlated with the present-day shallow-water assemblages of northern Japan. Based on the results of principal component comparison, sediments of the lower horizon of the Matsue Formation were deposited in an outer bay environment along with cold water elements. The upper Matsue Formation is suggested to have been deposited in an inner bay environment of about 3 m water depth similar to Matsushima Bay, Northeast Honshu, Japan. These results reveal that cold water elements extended to shallow area of San'in sedimentary basin on the southern Japan Sea borderland at the late Middle Miocene age.

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