932. MOLLUSCAN FAUNA FROM THE LATE MIOCENE HATSUSE FORMATION IN THE MIURA PENINSULA, KANAGAWA PREFECTURE, JAPAN

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  • 932. 三浦半島南部初声層産軟体動物化石群
  • 三浦半島南部初声層産軟体動物化石群〔英文〕
  • ミウラ ハントウ ナンブ ハツセソウサン ナンタイ ドウブツ カセキグン エ

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Abstract

The Hatsuse Formation distributed in the southern part of the Miura Peninsula mainly consists of well-bedded marine tuff breccia, lappili tuff, and scoriaceous sandstone and siltstone of marine origin with intercalated thin layers of pumice and conglomeratic sandstone. The molluscan fossils occur from a rather coarse-grained sandstone associated with fragments of pyroclastic rocks. The Hatsuse Fauna named herein is composed of three species of Gastropoda, one species of Scaphopoda, and 15 species of Bivalvia. The Hatsuse Fauna is characteristically and admixture of euneritic and subneritic forms, though all of them are warm-water dwellers. In consideration of species composition and their mode of occurrence, the shallow-water dwellers are interpreted to be the ones which were displaced into the outer neritic environment. The geologic age of the Hatsuse Fauna indicates Late Miocene, and is correlated with the Zushi Fauna distributed in the northern part of the Miura Peninsula, Kanagawa Prefecture and the Senhata Fauna of the Boso Peninsula, Chiba Prefecture.

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