Pleistocene Molluscan Fauna of the Sakishima Formation, Shima Peninsula, Central Japan

概要

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The paleoecology of the molluscan fauna of the Pleistocene Sakishima Formation has been investigated. One hundred and fifty-eight species of fossil mollusks have been found in the sandy silt of the new outcrop at Kiba, Isobe-cho, Mie Prefecture, as listed in Table 1. The molluscan fauna consists of one main assemblage and three subordinate ones. The former is the Clathrofenella-Varicorbula assemblage which is composed mainly of inhabitants of a muddy or sandy-muddy bottom and is autochthonous in origin. The three subordinate assemblages are Pygmaerota-Striarca (main components : inhabitants of rocky or gravelly shores), Anisocorbula-Babylonia (main components : sand bottom dwellers) and Sinusicola (main components : estuary dwellers), and the conditions of their occurrences indicate that they are allochthonous. The analysis of the molluscan fauna indicates that the sedimentary environment had the following properties : 1. Basin : bay with estuary. 2. Bottom character : mainly mud and sand in part ; rocky or gravelly shore and estuary with muddy bottom in the vicinity of this area. 3. Salinity : normal salinity of sea water in the bay ; brackish water in the estuary. 4. Depth : sublittoral, shallower than 30 m. 5. Water and current : coastal sea water predominant at bottom but oceanic water (warm current) present near the shore line.
東北大学の論文
1973-02-28