Ozuki Tuff and Shale Member

[ Top ] [ Japanese ]

Ozuki Tuff and Shale Member Yanagisawa et al., 1985

Volcanic rocks
Miocene
Intruded by: Quartz porphyry

Lithofacies (Upper): Volcanic conglomerate, Tuffaceous sandstone, Tuff, Siltstone/li>
Lithofacies (Middle): Tuff, Tuff breccia, Tuffaceous siltstone
Lithofacies (Lower): Tuffaceous siltstone, Lapilli tuff

Thickness: 0 - 150 m

Okura Formation
[ Upper ]
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Ozuki Tuff and Shale Member
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Okura Andesite Member
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Shimonagasaki Conglomerate and Shale Member
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[ Lower ]

Jonai Group
[ Upper ]
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Hakkaisan Formation
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Okura Formation
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[ Lower ]

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

Distribution: western flank of Mount Sakadoyama, Muikamachi town, Minamiuonuma city, Niigata pref.; Mizunashi river, Minamiuonuma city, Niigata pref.

Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)
Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)