Molluscan fossils from the Nisiyatu sand, Tiba prefecture, south Kanto, Japan

Ogose, S.

Chishitsugaku Zasshi = Journal of the Geological Society of Japan 74(4): 203-216


Accession: 019471518

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The Nisiyatu sand in Chiba prefecture is composed of unsorted fine- to coarse-grained sand occasionally with an interbedded tuffaceous layer. Over 175 species of molluscan fossils identified from this sand are listed. The stratigraphic position of fossiliferous beds within the sands varies locally. Both near-shore and deeper neritic elements are present in the fauna, the former being the more abundant. The near-shore elements seem to have been redeposited by warm bottom currents which carried them into the deeper neritic environment. The Nisiyatu sand may represent deposition during a Pleistocene interglacial in waters deeper and warmer than those of the present off the Boso peninsula.