Koutsubuna Member

[ Top ] [ Japanese ]

Koutsubuna Member Otsuka, 1955

Type locality: Nanbu brige, Nanbu, Nanbu city, Minamikoma county, Yamanashi prefecture
Volcanic rocks
late Miocene

Sedimentary facies: Marine
Sedimentary facies: Submarine volcanic mudflow deposit
Lithofacies: Andesite volcanic breccia, Tuff breccia, Tuff
Lithofacies (Minor): Interbedded sandstone and mudstone

Thickness: ca. 100 - 700 m
Lower limit: Conformity (Toinosawa Member)

Shimobe Formation (North)
[ Upper ]
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Uenotaira Interbeds of Volcaniclastic Rocks, Conglomerate and Sandstone Member
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Takenoshima Interbeds of Sandstone and Mudstone Member
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[ Lower ]

Shimobe Formation (South)
[ Upper ]
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Koutsubuna Member
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Toinosawa Member
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[ Lower ]

Fujikawa Group (Eastern zone)
[ Upper ]
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Akebono Formation
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Minobu Formation
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Shimobe Formation
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Nanbu - Utsubuna, Nanbu city, Minamikoma county, Yamanashi pref.

Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)