Middle Permian radiolarian fossils from the acidic tuffs of the Kanayama and Fukuji areas in the Hida "Gaien" Terrane, central Japan

  • Umeda Masaki
    Department of Geosciences, Faculty of Science, Osaka City University
  • Ezaki Yoichi
    Department of Geosciences, Faculty of Science, Osaka City University

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Other Title
  • 飛騨外縁帯金山地域・福地地域の酸性凝灰岩層からのペルム紀中世放散虫化石
  • ヒダ ガイエンタイ キンザン チイキ フクチ チイキ ノ サンセイ ギョウカイ

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The acidic tuffaceous strata in the Kanayama and Fukuji areas of the Hida "Gaien" (=Marginal) Terrane were previously designated as the Rosse Formation of Early Devonian time and the Mizuyagadani Formation of Early Permian time, respectively. However, the age of the extracted radiolarian fossils is different from the previously known age for the tuffaceous successions. The radiolarian fauna from the acidic tuffs is commonly characterized by Pseudoalbaillella fusiformis, Pseudoalbaillella sp. aff. P. longicornis and Follicucullus monacanthus, indicative of the F. monacanthus Zone of late Middle Permian. The stratigraphy should be revised thoroughly in those areas. The Middle Permian acidic tuffs are pervasive not only within the terrane but also among the adjacent terranes, indicating the prevalence of volcanic activity in the provenance. The present results are indispensable for the reconstruction of Permian paleogeography around Hida "Gaien" Terrane.


  • Fossils

    Fossils 62 (0), 37-44, 1997

    Palaeontological Society of Japan

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