Tsunatori Formation

[ Top ] [ Japanese ]

Tsunatori Formation Murayama, 1937

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

Sedimentary facies: Marine (Shellfish fossils)
Lithofacies: Sandstone, Mudstone, Acidic tuff

Thickness: 100 - 200 m
Upper limit: Conformity (Hishinai Formation), Unconformity (Motohata Formation, Kunimiyama Andesite)
Lower limit: Conformity (Suzukamogawa Formation)

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: Tsunatori, Waga town, Kitakami city, Iwate pref.
Fossils: Fish scales, Shellfishes, Foraminifera
Fossils (Plants): Acer subpictum, Betula maximowicziana, Sterculina sp., Quercus sp.

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.)