Oido Formation

Oido Formation (Yabe and Hatai, 1941) Takahashi and Matsuno, 1969

Type locality: Oido, Wakuya city, Toda county, Miyagi prefecture
Coherent formation
Miocene
Correlation: Shiogama Pyroclastic Rock, lower Ajiri Formation

Sedimentary facies: Marine, Terrestrial
Lithofacies: Conglomerate, Intermediate volcanic rocks, Tuffaceous sandstone

Thickness: 250 - 300 m or thicker
Upper limit: Conformity (Omatsuzawa Formation, Kameoka Formation), Unconformity (Shida Group), Abut unconformity (Upper Member)
Lower limit: Unconformity (Inai Group)

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
--------------
Kakeyama Conglomerate Member
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Oido, Wakuya city, Toda county, Miyagi pref.
Fossls: Shellfishes, Foraminifera

Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)
Ishii et al. (1982) Geology of the Matsushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 9p.)
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.)