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Sunagohara-Kubota Pyroclastic Deposit Yamamoto and Sudo, 1996

Abbr. Sn-KB

Invalid synonym: Kubota Pyroclastic Flow Deposit

• Type locality (Pyroclastic flow deposit): Kubota, Yanaizu city, Kawanuma county, Fukushima prefecture
• Type locality (Pyroclastic fall deposit): Kachigata, Aizubange city, Kawanuma county, Fukushima prefecture
• Tephra
• middle Pleistocene (0.22 Ma, FT)

• Lithofacies (inside of Sunagohara caldera): Pyroclastic flow deposit
• Lithofacies (outside of Sunagohara caldera): Pyroclastic fall deposit
• Lithofacies: Cummingtonite-bearing biotite rhyolite
• Lithofacies (inside of Sunagohara caldera): Lapilli tuff
• Lithofacies (outside of Sunagohara caldera, Upper, SnKB-2): Volcanic ash
• Lithofacies (outside of Sunagohara caldera, Lower, SnKB-1): Interbedded lapilli and volcanic ash

• Source: Sunagohara caldera
• Host: Kanbara Group, Higher I Terrace Deposit (Kawamata)
• Thickness: ca. 1 - 50 m

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

• Distribution: Kubota, Yanaizu city, Kawanuma county, Fukushima pref.; Kachigata, Aizubange city, Kawanuma county, Fukushima pref.; Tsurugaike, Shimogo city, Minamiaizu county, Fukushima pref.
• Deposit: Sunagohara kaolinite deposit

• Kamoi et al. (2016) Geology of the Niigata and Uchino District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 2p.)
• Kubo et al. (2015) Geology of the Kawamata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)
• Yamamoto et al. (2006) Geology of the Kitakata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 5p.)
• Yamamoto and Komazawa (2004) Geology of the Miyashita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 5p.)
• Yamamoto (1999) Geology of the Tajima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 8p.)