Suzukamogawa Formation

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Suzukamogawa Formation Kitamura, 1959

Type locality: Suzukamo river, Waga town, Kitakami city, Iwate prefecture
Coherent formation
Miocene
Intruded by: Maetsukamiyama Acidic Volcanic Rocks

Sedimentary facies: Shallow marine (Shellfish fossils)
Lithofacies: Sandstone, Mudstone
Lithofacies (Minor): Pyroxene andesite lava, Volcaniclastics
Lithofacies (Lower): Conglomerate

Thickness: 100 - 500 m
Upper limit: Conformity (Tsunatori Formation), Interfingered (Takamoriyama Andesite Member)
Lower limit: Unconformity, partly conformity (Oishi Formation), Interfingered (Takamoriyama Andesite Member)

Suzukamogawa Formation
[ Upper ]
'''''''/,,,,,,,
Takamoriyama Andesite Member
'''''''/,,,,,,,
[ Lower ]

Eastern Kawajiri, Iwate pref.
[ Upper ]
~~~~~~~~~~~~~~
Hishinai Formation
--------------
Tsunatori Formation
--------------
Suzukamogawa Formation
~~~~~~~-------
Oishi Formation
~~~~~~~~~~~~~~
Oarasawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Suzukamo river, Waga town, Kitakami city, Iwate pref.
Fossils: Plants
Fossils (Shellfishes): Chlamys crassivenia, Lima cf. konnoi, Natica (Tectonatica) janthostoma, Periploma sp., Portlandia (Megayoldia) lischkei
Fossils (Foraminifera): Dentalina subsoluta, Marginulina sendaiensis, Robulus miyagiensis, Robulus pseudorotulatus, Sigmomorphina notoensis

Ozawa et al. (1971) Geology of the Kawashiri District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 40p. (in Japanese with English abstract 5p.)