849. MIDDLE CARBONIFEROUS ORTHOCERATACEAE AND PSEUDORTHOCERATACEAE (MOLLUSCA : CEPHALOPODA) FROM THE AKIYOSHI LIMESTONE, YAMAGUCHI PREFECTURE : MOLLUSCAN PALEONTOLOGY OF THE AKIYOSHI LIMESTONE GROUP-VIII

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  • 849. 秋吉石灰岩からの石炭紀中期頭足類 Orthocerataceae, Pseudorthocerataceae
  • 秋吉石灰岩からの石炭紀中期頭足類Orthocerataceae,Pseudorthocerataceae〔英文〕
  • アキヨシ セッカイガン カラ ノ セキタンキ チュウキ トウソクルイ Orth

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Abstract

The Akiyoshi Limestone Group (Early Carboniferous to Middle Permian) in Yamaguchi Prefecture contains a diverse fossil molluscan fauna, including cephalopods. In this paper, we describe for the first time 6 species of orthocerid cephalopods from the Isa area where lies in the southwestern margin of the Akiyoshi Limestone Plateau (s.l.). Stratigraphic levels and lithofacies of the cephalopods locality are divided into two types i.e., 1) Bioclastic grainstone, rich in crinoid fragments, of the Pseudostaffella antiqua zone (Bashkirian) including Brachycycloceras sp. indet. and 2) Coquinite of the Fusulinella biconica zone (Moscovian), limestone of which yields Brachycycloceras akiyoshiensis, sp. nov., Geisonoceras sejunctus, sp. nov., Geisonocerina cribrella, sp. nov., Striacoceras (?) sp. indet. and Reticycloceras (?) sp. indet.

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