Ojika Group

Coherent formation
Middle Jurassic, Bajocian - Early Cretaceous, Berriasian (Valanginian?) (Ammonoids)
Intruded by: Ojika Mass

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

Thickness: ca. 4,200 m
Lower limit: Unconformity (Inai Group)

Ojika Group
[ Upper ]
--------------
Ayukawa Formation
--------------
Oginohama Formation
--------------
Tsukinoura Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Oshika peninsula, Ishinomaki city, Miyagi pref.
Distribution: Yoriiso - Tomari, Ishinomaki city, Miyagi pref.; Oura - Izushima island, Onagawa city, Oshika county, Miyagi pref.

Takizawa et al. (1987) Geology of the Yoriiso District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 5p.)
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.)
Takizawa et al. (1974) Geology of the Kinkasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 5p.)