Teuchizawa Breccia Member

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Teuchizawa Breccia Member Akiyama, 1957

Type locality: Teuchizawa river, Teuchizawa, Minobu city, Minamikoma county, Yamanashi prefecture
Coherent formation
late Miocene

Sedimentary facies: Marine
Lithofacies: Andesite - Basalt breccia
Lithofacies (Minor): Tuffaceous sandstone, Tuff, Conglomerate, Sandstone
Sedimentary structures: Graded bedding

Thickness: 80 m or thinner
Distribution (South - North): ca. 500 m or less
Upper limit: Conformity (Yogosawa Conglomerate Member)
Lower limit: Unconformity (Tsukimibashi Volcaniclastic Member, Hara Formation, Takatori Volcaniclastic Rocks, Sandstone and Mudstone Member)

Akebono Formation
[ Upper ]
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Yogosawa Conglomerate Member
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Kawadaira Mudstone Member
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Osozawa Sandstone Member
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Teuchizawa Breccia Member
~~~~~~~~~~~~~~
[ Lower ]

Fujikawa Group (Central zone)
[ Upper ]
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Hamaishidake Formation / Akebono Formation
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Aimata Formation
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Kuonji Formation
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Hara Formation
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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: Teuchizawa river, Teuchizawa, Minobu city, Minamikoma county, Yamanashi pref.
Fossils: Shell fragments, Pipe rocks

Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)