Towada Biscuit 2 Tephra

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Towada Biscuit 2 Tephra Tohoku Region Quaternary Research Group, 1969

Abbr.: BP2

Type locality: Nakayashiki, Towada city, Aomori prefecture
Tephra
late Pleistocene (55 - 15 ka)

Lithofacies: Rhyolitic
Lithofacies (Upper): Pumice fall deposit, Volcanic ash
Lithofacies (Middle): Volcanic ash
Lithofacies (Lower): Pumice fall deposit
Lithofacies (Minor): Obsidian

Source: Towada caldera
Thickness (Upper): 32 cm
Thickness (Middle): 20 cm
Thickness (Lower): 7 cm

Towada Caldera-forming Stage Tephra Group
[ Upper ]
~~~~~~~~~~~~~~
Towada Hachinohe Fall Tephra
~~~~~~~~~~~~~~
Towada Biscuit 2 Tephra
~~~~~~~~~~~~~~
Towada Kirida Tephra
~~~~~~~~~~~~~~
Towada Godo Tephra
~~~~~~~~~~~~~~
Towada Kibidango Tephra
~~~~~~~~~~~~~~
Towada Red Pumice Tephra
~~~~~~~~~~~~~~
[ Lower ]

Towada caldera
[ Upper ]
~~~~~~~~~~~~~~
Towada Post-caldera Stage Tephra Group
~~~~~~~~~~~~~~
Towada Caldera-forming Stage Tephra Group
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: southern part of Kamikita plain, Aomori pref., Japan
Distribution: Nakayashiki, Towada city, Aomori pref., Japan

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.)