<国立科博専報>北陸地方石川, 富山県境付近の中新統砂子坂層産潮間帯性貝類化石群

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In addition to OGASAWARA's work (1976), the writers report the "intertidal-lagoon" type molluscan assemblage from the Miocene Sunakozaka Formation distributed around the northern foot of Mt. Iozen extend over the prefectural boundary of Ishikawa and Toyama, Hokuriku District. This newly recorded molluscan assemblage can be safely compared with the Arcid-Potamid fauna reported from the Kurosedani Formation by TSUDA (1965). Consequently, the molluscan assemblage of the Sunakozaka Formation can be divided into two assemblages; one is the intertidal-lagoonal assemblage characterized by Vicarya yokoyamai, Vicaryella notoensis, Anadara kakehataensis, Hiatula minoensis and others which are found in locality, no. MS-1,another is the"open-sea shallow water"assemblage occurred in the locality at Ichise, Kanazawa City. This faunal replacement from intertidal type to shallow sea type is very similar to that in the Kurosedani Formation (TSUDA, 1960,etc.), however, the thickness of the two formations is remarkably different to each other caused by the difference in rate of sedimentation.
国立科学博物館の論文
1986-12-01