Oido Sandstone Member

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Oido Sandstone Member Yabe and Hatai, 1941

Invalid synonym: Ishitoriba Formation

Coherent formation
early Miocene
Contemporaneous heterotopic facies: Nonodake Pyroclastic Member, Wabuchi Conglomerate Member, Oido Tuffaceous Sandstone Member

Sedimentary facies: Marine
Lithofacies: Tuffaceous sandstone
Lithofacies (Minor): Pumice tuff, Tuff breccia, Tuff, Siltstone

Upper limit: Unconformity (Kameoka Formation)
Lower limit: Partly interfingered (Nonodake Pyroclastic Member)

Oido Formation (Wakuya)
[ Upper ]
--------------
Oido Sandstone Member
-------''''/,,,
Nonodake Pyroclastic Member
-------''''/,,,
Wabuchi Conglomerate Member
~~~~~~~~~~~~~~~~
[ Lower ]

Oido Formation (Matsushima)
[ Upper ]
--------------
Oido Tuffaceous Sandstone Member
--------------
Asahiyama Andesite Member
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Kakeyama Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Nonodake - Suganosawa - Narisawa, Wakuya city, Toda county, Miyagi pref.; Mount Kagobo, Osaki city, Miyagi pref.; Nabirenuma, Misato city, Toda county, Miyagi pref.
Fossils (Shellfishes): Chlamys kaneharai, Lucinoma acutilineata, Lucinoma otukai, Mizuhopecten cf. kagamianus, Panope japonica, Panope nomurai, Placopecten akihoensis, Placopecten wakuyaensis, Portlandia (Megayoldia) thraciaeformis, Thracia hitosaoensis

Takahashi and Matsuno (1969) Geology of the Wakuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 6p.)