Omine Formation

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Omine Formation Kobayashi and Hirabayashi, 1952

Type locality: defined to each member
Coherent formation
Pliocene

Lithofacies: Dacite lava, Welded tuff, Conglomerate
Lithofacies (Minor): Sandstone, Mudstone, Tuffaceous sandstone

Thickness: ca. 1,650 m
Upper limit: Unconformity (Lower Tephra, Omine Gravels, Omine Debris Deposits, Sanozaka Collapse Deposits, Kamishiro Lacustrine Deposits)
Lower limit: Unconformity (Miasa Formation)

Omine Formation
[ Upper ]
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Oanayama Member
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Hino Member
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Oshio Pyroclastic Flow Deposit
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[ Lower ]

Omachi, Nagano pref.
[ Upper ]
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Omine Formation
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Miasa Formation
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[ Lower ]

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

Distribution: Shingyo, Omachi city, Nagano pref.

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.)