The oldest vesicomyid bivalves from the Japan Sea borderland

Vesicomya kawadai (Aoki) and Calyptogena sp. (Bivalvia: Vesicomyidae) were first obtained from the lower middle Miocene Higashibessho Formation in Toyama Prefecture. This is the oldest record of vesicomyids in the Japan Sea borderland. The Higashibessho Formation at the fossil locality consists of m...

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Bibliographic Details
Published inVenus (Fukuyama-shi, Japan) Vol. 60; no. 3
Main Authors Amano, K. (Joetsu Univ. of Education, Niigata (Japan)), Hamuro, T, Hamuro, M, Fujii, S
Format Journal Article
LanguageEnglish
Published 01.09.2001
Subjects
BIOGEOGRAPHY
BIVALVIA
PALAEONTOLOGY
SEA OF JAPAN
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Summary:Vesicomya kawadai (Aoki) and Calyptogena sp. (Bivalvia: Vesicomyidae) were first obtained from the lower middle Miocene Higashibessho Formation in Toyama Prefecture. This is the oldest record of vesicomyids in the Japan Sea borderland. The Higashibessho Formation at the fossil locality consists of mudstone and alternating beds of sandstone and mudstone which deposited in the bathyal depths of the Hokuriku-Sanin-oki Trough. The deep-sea basin was formed by the early middle Miocene rapid subsidence,in relation to the back-arc opening of the Japan Sea. Vesicomya kawadai (Aoki) first occurred from the lower Miocene of the Pacific side and invaded into the Japan Sea just after the formation of the deep-sea basin, maybe together with Calyptogena sp. Both species of vesicomyids may be formed a chemosynthetic community in the deep-sea basin of the Japan Sea.
Bibliography:L60
2002001504
ISSN:0042-3580