Oanayama Member

Oanayama Member Kobayashi and Hirabayashi, 1955

Invalid synonym: Oanayama Conglomerate Member, Oanayama Sandstone and Conglomerate Member

Type locality: Mount Oanayama, Ikeda city, Kitaazumi county, Nagano prefecture
Coherent formation
Pliocene (2.9 Ma, K-Ar)

Sedimentary facies: Terrestrial
Lithofacies: Conglomerate
Lithofacies (Minor): Sandstone, Tuff

Thickness: ca. 500 m or thicker
Upper limit: Unconformity (Terrace deposit)
Lower limit: Transitional (Hino Member)

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

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

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

Distribution: Mount Oanayama - Takizawa - Yashiro pass - Rikugo - Hanami, Ikeda city, Kitaazumi county, Nagano pref.
Tephra: Shimekake Tuff

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.)