福井県越前海岸に分布する下部中新統国見層の生痕化石群集

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  • フクイケン エチゼン カイガン ニ ブンプ スル カブ チュウ シントウクニミソウ ノ セイコン カセキ グンシュウ
  • Ichnofauna from the Lower Miocene Kunimi Formation along the Echizen Coast, Fukui Prefecture, central Japan

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Trace fossils from the Lower Miocene (about 18 to 16 Ma) Kunimi Formation in the Echizen Coast area, Fukui Prefecture, central Japan. Ichnofacies clarified that the paleoenvironment in the Kunimi Formation are fluvial foot‒print ichnofacies, tidal flat Psilonichinus ichnofacies and shore Ophiomorpha ichnofacies. The foot‒print ichnofacies occurs in alternation of thin laminated fine‒grained sandstone and mudstone with black mudstone, and is characterized by foot‒print on the bedding plane. The Psilonichnus ichnofacies occurs in bioturbated sandy mudstone and muddy fine‒grained sandstone, and is characterized by vertical and horizontal sand pipe as Psilonichinus tubiformis, Psilonichinus cf. upsilon and Planolites isp. The Ophiomorpha ichnofacies occurs in medium to fine sandstone, and is characterized by Macaronichnus segregatis andOphiomorpha nodosa. The ichnofacies show that the Kunimi Formation was formed by the repetition of the fluvial and shallow marine environment, and the sedimentary basin became deep gradually.

source:https://karin21.flib.u-fukui.ac.jp/webopac/SB10010406

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