Tashirotai Lacustrine Formation

Tashirotai Lacustrine Formation Muraoka and Takakura, 1988

Type locality: Komagome river, Aomori city, Aomori prefecture
Caldera-fill deposit
Coherent formation
Pleistocene (ca. 0.4 - 0.1 Ma)
Contemporaneous heterotopic facies: Older Akakuradake Debris Avalanche Deposit

Sedimentary facies: Lacustrine
Lithofacies: Siltstone
Lithofacies (Minor): Debris flow deposit, Scoria fall deposit

Thickness: 100 - 200 m or thicker?
Upper limit: Unconformity (Towada Hachinohe Pyroclastic Flow Deposit)

Kita-Hakkoda volcanoes
[ Upper ]
~~~~~~~~~~~~~~
Odake Lava / Odake Pyroclastic Rocks
~~~~~~~~~~~~~~
Idodake Lava / Idodake Pyroclastic Rocks
'''''''/,,,,,,
Akakuradake Lava / Akakuradake Pyroclastic Rocks
~~~~~~~~~~~~~~
Kodake Lava
~~~~~~~~~~~~~~
Iodake Lava
~~~~~~~~~~~~~~
Sennintai Lava and Pyroclastic Rocks
~~~~~~~~~~~~~~
Tamoyachidake Lava
~~~~~~~~~~~~~~
Takadaotake Lava and Pyroclastic Rocks
~~~~~~~~~~~~~~
Hinadake Lava and Pyroclastic Rocks
~~~~~~~~~~~~~~
Tashirotai Lacustrine Formation
~~~~~~~~~~~~~~
[ Lower ]

Hakkoda caldera
[ Upper ]
~~~~~~~~~~~~~~
Kita-Hakkoda volcanoes
~~~~~~~~~~~~~~
Minami-Hakkoda volcanoes
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Komagome river, Aomori city, Aomori pref.

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.)