Tsukihiyama Volcanics

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Tsukihiyama Volcanics Kudo, 2005

Type locality: Senjo creek - Umanokami - Omoya, Towada city, Aomori prefecture
Some submarine volcanoes
Volcanic rocks
Miocene (7 - 5 Ma; 5.5 - 5.1 Ma, K-Ar)

Sedimentary facies: Marine, partly Terrestrial?
Lithofacies: Andesite
Lithofacies (Minor): Basalt, Dacite
Lithofacies: Lava, Hyaloclastite, Tuff breccia
Lithofacies (Minor): Pumice lapilli tuff, Tuffaceous sandstone, Pumiceous conglomerate

Mode of eruption: Submarine phreatomagmatic
Thickness: ca. 250 m
Lower limit: Interfingered (Komasuzawa Formation)

Towada, Aomori pref.
[ Upper ]
~~~~~~~~~~~~~~
Tsukihiyama Volcanics
'''''''/,,,,,,
Komasuzawa Formation
--------------
Dochi Formation
--------------
Wadagawa Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Senjo creek - Mount Umanokami - Omoya - Komoya, Mount Tsukihi, Towada city, Aomori pref.; Tsukushimori - Taka pass, Towada city, Aomori pref.; Domeki, Towada city, Aomori pref.

Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)