Molluscan fauna from the late miocene hatsuse formation in the miura peninsula kanagawa prefecture japan

Okumura, K.; Yamagishi, Y.

Transactions and Proceedings of the Palaeontological Society of Japan New Series 165: 1009-1023


Accession: 007565267

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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 an 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. The species discussed are Mikadotrochus cf. yoshiwarai, Crepidula cf. nidatoriensis, Cypraea sp., Fissidentalium cf. yokoyamai, Glycymeris rotunda, Chlamys miurensis, Amussiopecten akiyamaea, Miyagipecten matsumoriensis, Indocrassatella cf. tenuilirata, Laevicardium angustum, L. sp., Clinocardium cf. hataii, C. hatsusense, n. sp., C. sp., Pitar kaniei, Oxyperas bernardi, Azorinus abbreviatus, Anisocorbura cf. verusta and A. sp.