Karasumoriyama Volcaniclastic Member

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Karasumoriyama Volcaniclastic Member (Akiyama, 1957) Ozaki and Sugiyama, 2018

Type locality: Hayakawa bridge - Kannon bridge, Minobu city, Minamikoma county, Yamanashi prefecture
Volcanic rocks
late Miocene
Correlation: Seigo Volcaniclastic Member, Shinoisan Member

Sedimentary facies: Marine
Lithofacies: Andesite volcanic breccia, Tuff breccia, Tuff, Tuffaceous sandstone
Lithofacies (Minor): Andesite lava, Conglomerate, Tuffceous sandstone, Mudstone, Dacite tuff, Volcanic conglomerate
Sedimentary structures: Graded bedding, Parallel stratification

Thickness: ca. 250 - 1,600 m
Upper limit: Conformity (Osozawa Sandstone Member)
Lower limit: Conformity (Takatori Volcaniclastic Rocks, Sandstone and Mudstone Member)

Aimata Formation (North)
[ Upper ]
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Karasumoriyama Volcaniclastic Rocks Member
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Takatori Volcaniclastic Rocks, Sandstone and Mudstone Member
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[ Lower ]

Aimata Formation (South)
[ Upper ]
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Shinoisan Member
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Tokuma Member
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[ 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 ]

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

Distribution: Hayakawa bridge - Kannon bridge - Awakura - Osozawa, Minobu city, Minamikoma county, Yamanashi pref.; Sensuwa - Shionoue - Akazawa, Hayakawa city, Minamikoma county, Yamanashi pref.
Fossils (Trace fossils): Ophiomorpha sp.

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.)