813. 高知県佐川町周辺の下部白亜系産二枚貝化石

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タイトル別名
  • 813. LOWER CRETACEOUS BIVALVES FROM THE SAKAWA AREA, SHIKOKU
  • 高知県佐川町周辺の下部白亜系産二枚貝化石
  • コウチケン サカワチョウ シュウヘン ノ カブ ハクアケイサン 2マイガイ カ

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説明

This paper deals with the description of bivalve fossils from the Lower Cretaceous System of the Sakawa area, Shikoku. Thirty-three species of 24 genera, including four new species, i.e., Cosmetodon tomochiensis, sp. nov., Parvamussium tosaense, sp. nov., Parvamussium kattoi, sp. nov. and Protocardia (Protocardia) amanoi, sp. nov., are described from various localities in this area. The bivalve fauna of the Bunjo Formation is nearly identical with that of the Aptian Hagino Formation of the Monobe area, Shikoku. Judging from the bivalve fauna and associated ammonites, the Yotsushiro Formation and the upper member of Tosakamo Formation are closely similar in their faunal compositon to each other and are probably correlated with the upper part of the Hibihara Formation (mainly Albian) of the Monobe area. The faunas of the lower member of Tosakamo Formation and Kurohara Formation closely resemble that of the lower part of the Hibihara Formation (mainly Aptian), having many common species among them. Although the geological age of the lower member of Tosakamo Formation, inclusive of the Kurohara Formation, is suggested at the Apitan and nearly the same as the presumable age of the Bunjo Formation, the bivalve fauna of the Bunjo Formation is quite different from that of the lower member of Tosakamo Formation except for the occurrence of several worldwide bivalve species and ammonites. The difference is probably due to ecological dissimilarity between them.

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