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This paper gives a redescription of a Miocene pectinid, Cryptopecten yanagawaensis (NOMURA and ZINBO) which occurs mainly in the beds aged 16 Ma, the early Medial Miocene. The present species is one o...f the most characteristic ones of the molluscan fauna of the Moniwa Formation and is presumed to be ancestor of the Pliocene and Recent species, C. vesiculosus (DUNKER). By way of block sampling method the writer collected more than 200 free specimens from 18 samples taken from the Moniwa Formation which yields many best preserved specimens. Redescription of the species is made by applying the results from paleoautoecological analysis. This paper also refers to the geographic and stratigraphic distribution and paleoecology of the species.続きを見る
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Mendeley出力
25_02_p247