948. 高知県足摺岬の清水累層から産する初期中新世 (アキタニアン期) 大型有孔虫

概要

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rights: 日本古生物学会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110002703349/Early Miocene (Aquitanian) larger Foraminifera are first described from the calcareous matrix of volcanic conglomerate and sandstone of the Shimizu Formation in the Shimanto Belt, Tosa Shimizu City, Ashizuri Cape, Kochi Prefecture, Shikoku. The joint occurrence of Miogypsinoides dehaartii (van der Vlerk), Spiroclypeus margaritata (Schlumberger) and Victoriella conoidea (Rutten) enables the age of the calcareous matrix of volcanic conglomerate and sandstone of the Shimizu Formation to be assigned to the Early Miocene (Aquitanian). Detailed stratigraphic studies, which were carried out in Ashizuri Cape, Tosa Shimizu City, Shikoku, show that the mudstone yielding the Late Eocene (Priabonian) larger Foraminifera described by Matsumaru and Kimura (1989) is not in the Shimizu Formation, but in the Kurusuno Formation (Myint Thein et al., 1991; Myint Thein, 1992). As such, the newly described larger Foraminifera from the Shimizu Formation indicate an age for the formation of Early Miocene (Aquitanian).
1993-04-30