Oido Tuffaceous Sandstone Member

Asahiyama Andesite Member (Shimakura and Hatai, 1939) Ishii et al., 1982

Invalid synonym: Asahiyama Agglomerate Beds

Type locality: Mount Asahi, Ishinomaki city, Miyagi prefecture
Volcanic rocks
Miocene
Correlation: Nonodake Pyroclastic Member

Lithofacies: Augite hypersthene andesite lava
Lithofacies (Minor): Hyaloclastite (Volcanic breccia)

Thickness: 150 m or thicker
Upper limit: Conformity (Oido Tuffaceous Sandstone Member), Unconformity (Tawaraniwa Formation)

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: Mount Asahi - Kusata, Ishinomaki city, Miyagi pref.

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.)