Latest Jurassic to earlier Early Cretaceous foraminifers from the Torinosu-type limestone blocks in Southwest Japan: Constraints on chrolonogic calibration of the Torinosu-type limestones

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  • Kobayashi Fumio
    Institute of Natural and Environmental Sciences, University of Hyogo
  • Wernli Roland
    Département de Géologie et Paleontology, Université de Genève

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  • 西南日本の鳥巣型石灰岩ブロックのジュラ紀最後期から白亜紀古世前期有孔虫化石：鳥巣型石灰岩年代決定に関わる制約要素

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Abstract

Thirty-six taxa of foraminifers were recognized from 31 samples of the Torinosu-type limestone blocks in South of Yatsushiro, Azamui (Kyushu), Nomura (Shikoku), and Yura (Kii) areas, Southwest Japan. Those identified in species level are confined to five: Nautiloculina broennimanni, Freixialina planispiralis, Charentia cuvillieri, Melathrokerion spirialis, and Pseudocyclammina lituus. Such genera as Kurnubia and Alveosepta showing the pre-Kimmeridgian, and orbitolinids characteristic in the post-late Hauterivian are completely absent in them. The Torinosu-type limestones studied are assigned to the latest Jurassic to earlier Early Cretaceous based on the biostratigraphic distribution of the identified five species in the western Tethyan region and chronologic constraints on the studied material excluding the pre-Kimmeridgian and post-late Hauterivian faunal elements.

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