Toguhama Formation

Toguhama Formation (Shibata and Fujita, 1966) Ishii et al., 1983

Minatohama Siltstone Member was included in Siltstone Member of Otsuka Formation by Ishii et al. (1983).

Type locality: Toguhama - Ekiraku, Shichigahama city, Miyagi county, Miyagi prefecture
Volcanic rocks
middle Miocene (15.5 Ma, K-Ar)
Interfingered: Siltstone Member

Sedimentary facies: Marine
Sedimentary facies: Pyroturbidite
Lithofacies: Dacitic breccia, Tuffaceous sandstone
Lithofacies (Minor): Tuffaceous siltstone
Paleocurrent: West to East

Thickness: 100 - 130 m
Upper limit: Interfingered (Siltstone Member), Unconformity (Shiomidai Formation)
Lower limit: Unconformity (Rifu Formation, Sauramachi Formation, Ajiri Formation)

Toguhama Formation
[ Upper ]
--------------
Tsurugaya Andesite Member / (Invalid name) Nirayama Dacite Member
--------------
[ Lower ]

Matsushimawan Group
[ Upper ]
~~~~~~~~~~~~~~
Otsuka Formation
-------'''/,,,
Toguhama Formation
--------------
Matsushima Formation
--------------
Ajiri Formation
--------------
Sauramachi Formation
--------------
Shiogama Pyroclastic Rock
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Toguhama - Ekiraku, Shichigahama city, Miyagi county, Miyagi pref.; Takasaki, Tagajo city, Miyagi pref.

Kitamura et al. (1986) Geology of the Sendai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 134p. (in Japanese with English abstract 9p.)
Ishii et al. (1983) Geology of the Shiogama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 6p.)