Itadome Formation

Itadome Formation (Imaizumi, 1949) Muraoka and Hase, 1990

Invalid synonym: Middle Hayasemori Formation, Tsubokawa Formation

Type locality: Aomori prefecture
Coherent formation
Miocene
Correlation: Yotsuzawa Formation?
Intruded by: Arakawa Dolerite, Jogakura Dacite

Sedimentary facies: Marine
Sedimentary facies (Lower, East): Submarine volcano
Lithofacies: Altered dacite lava

Upper limit: Unconformity (Obirakiyama Pyroclastic Flow Deposit, Iodake Lava, Wadagawa Formation, Komasuzawa Formation)

Itadome Formation
[ Upper ]
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Nashikizawa Tuff Member
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Lower Member
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[ Lower ]

Kuroishi, Aomori pref.
[ Upper ]
~~~~~~~~~~~~~~
Nuruyu Formation
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Itadome Formation
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Origamizawa Formation
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Manzaemonyama Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Itadome - Lake Nijinoko, Kuroishi city, Aomori pref.; Motonagamine - Mitsumenai, Owani city, Minamitsugaru county, Aomori pref.; Izuchi, Owani city, Minamitsugaru city, Aomori pref.; Dogatai, Osawa, Hirosaki city, Aomori pref.; Mount Ishikura, Aomori city, Aomori pref.; Senjo creek, 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.)
Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)
Muraoka and Hase (1990) Geology of the Kuroishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 124p. (in Japanese with English abstract 8p.)