Seto Tuff Member

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Seto Tuff Member Akahane, 1975

Type locality: Iwao bridge, Seto, Nadachi ward, Joetsu city, Niigata prefecture
Coherent formation
Rift basin sediments
Pliocene (3.6 Ma)

Sedimentary facies: Marine
Lithofacies: Tuff, Pumice tuff

Thickness: 4 - 20 m
Upper limit: Conformity (Iwaobashi Sandstone Member, Tsutsuishi Alternation of Sandstone and Mudstone Member)
Lower limit: Conformity (Nakanomata Mudstone Member)

Kawazume Formation (West)
[ Upper ]
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Tsutsuishi Alternation of Sandstone and Mudstone Member
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Seto Tuff Member
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[ Lower ]

Kawazume Formation (Kuwatori valley)
[ Upper ]
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Tsutsuishi Alternation of Sandstone and Mudstone Member
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Iwaobashi Sandstone Member
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Seto Tuff Member
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Doguchi Alternation of Sandstone and Mudstone Member
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[ Lower ]

Kawazume Formation (East)
[ Upper ]
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Nagahama Mudstone Member
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Tsunako Conglomerate Member
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[ Lower ]

Nishikubiki Group
[ Upper ]
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Kawazume Formation
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Nodani Formation
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Nanbayama Formation
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[ Lower ]

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

Distribution: Seto - Doguchi, Nadachi ward, Joetsu city, Niigata pref.; Kawazume - Shitakura - Ohora - Taio, Itoigawa city, Niigata pref.

Nagamori et al. (2018) Geology of the Itoigawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 75p. (in Japanese with English abstract 3p.)
Akahane and Kato (1989) Geology of the Takada-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 3p.)