Nagaiwa Member

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Nagaiwa Member (Takeuchi and Sakamoto, 1976) Kato et al., 1989

Invalid synonym: Nagaiwa Formation

Type locality: Hijirigawasawa creek, Ooka, Nagano city, Nagano prefecture
Coherent formation
Pliocene
Correlation: Okubo Mudstone and Sandstone Member

Sedimentary facies: Shallow marine
Lithofacies: Sandstone
Lithofacies (Minor): Conglomerate, Mudstone

Thickness: 300 - 600 m or thicker
Upper limit: Conformity (Joshita Member), Unconformity (Hijiriyama Volcanics, Ooka Mudflow Deposit)
Lower limit: Conformity (Komiji Formation)

(Invalid name) Shigarami Formation (Togakushi, Nagano pref.)
[ Upper ]
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Ogikubo Sandy Mudstone Member
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Arakurayama Pyroclastic Member
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Takafu Mudstone Member
'''''''/,,,,,,
Gonda Sandstone Conglomerate Member
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[ Lower ]

(Invalid name) Shigarami Formation (Nagano, Nagano pref.)
[ Upper ]
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Ogikubo Sandy Mudstone Member
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Arakurayama Pyroclastic Member / Hirose Mudstone Member / Joshita Member
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Okubo Mudstone and Sandstone Member
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[ Lower ]

(Invalid name) Shigarami Formation (Komiji, Nagano pref.)
[ Upper ]
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Joshita Member
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Nagaiwa Member
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[ Lower ]

(Invalid name) Shigarami Formation (Hikage, Nagano pref.)
[ Upper ]
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Tanogashira Member
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Idoirisawa Member
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Hiratokosawa Member
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[ Lower ]

Hokushin Group
[ Upper ]
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Shigarami Formation
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Ogawa Formation
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Aoki Formation
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[ Lower ]

northern Nagano pref.
[ Upper ]
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Hokushin Group
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Chushin Group
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[ Lower ]

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

Distribution: Hijirigawasawa creek - Minamimaki - Tsukudami - Nagaiwa, Ooka, Nagano city, Nagano pref.
Fossils (Trace fossils): Pipe rocks

Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)