Torakeyama Formation

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Torakeyama Formation

Type locality: Mount Trake, Yuzawa city, Akita prefecture
Volcanic rocks
Miocene - Pliocene
Intruded by: Andesite
Correlation: Kaneyama Formation

Lithofacies: Dacitic tuff, Volcanic lapilli tuff, Welded tuff, Tuff breccia
Lithofacies (Minor): Welded tuff, Sandstone

Thickness: 600 - 700 m
Upper limit: Unconformity (Sanzugawa Formation, Kawaiyama Dacites)
Lower limit: Unconformity (Nozoki Formation)

Torakeyama Formation
[ Upper ]
?--?--?--?--?-
Torakeyama Tuff Member
--------------
Oyu Welded Tuff Member
--------------
Minasegawa Tuff Member
?--?--?--?--?-
[ Lower ]

Uzen-Kaneyama (Eastern)
[ Upper ]
--------------
Sanzugawa Formation
~~~~~~~~~~~~~~
Torakeyama Formation
~~~~~~~~~~~~~~
Nozoki Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Mount Trake, Yuzawa city, Akita pref.

Takashima and Koshiya (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.97-109 DOI
Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)