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Towada-Chuseri Pyroclastic Fall Deposit (Oike et al, 1966) Takarada and Muraoka, 2004

Abbr.: To-Cu, Cu

Invalid synonym: Chuseri Pumice Fall Deposit

• Type locality: 380 m above sea level, Sosupe river, Towada city, Aomori prefecture
• Tephra
• late Pleistocene (6 cal ka BP, 6.5 - 4.2 ka, ¹⁴C)
• Correlation: Akka Volcanic Ash

• Lithofacies: Dacitic
• Lithofacies: Pumice fall deposit

• Source: Nakanoumi caldera, Towada caldera
• Thickness: ca. 4 m
• Thickness (Utarube Tuff): 18 cm
• Thickness (Kanagasawa Pumice Fall Deposit): 13 cm
• Upper limit: Unconformity (Towada-Kemanai Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Towada-Hachinohe Pyroclastic Flow Deposit, Koganetai Lava, Ohanabeyama Lava)

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

• Distribution: Sosupe river, Towada city, Aomori pref.; Akanuma, 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.)