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Sunagohara-Sakasegawa Pyroclastic Flow Deposit Yamamoto and Sudo, 1996

Abbr. Sn-SK

Invalid synonym: Adachigahara Tephra

• Type locality: Sakase river, Niitsuru, Aizumisato city, Onuma county, Fukushima prefecture
• Tephra
• middle Pleistocene (0.29 Ma, FT)

• Lithofacies: Biotite Rhyolite
• Lithofacies (Upper): Lapilli tuff
• Lithofacies (Lower): Accretionary lapilli-bearing pyroclastic fall deposit

• Source: Sunagohara caldera
• Host: Kanbara Group, Higher I Terrace Deposit (Kawamata)
• Thickness (Upper): ca. 0 - 5 m
• Thickness (Lower): ca. 0.5 - 3 m
• Lower limit: Conformity

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

• Distribution: Sakase river, Niitsuru, Aizumisato city, Onuma county, Fukushima pref.; Yokota, Kaneyama city, Fukushima pref.

• 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 and Hasebe (2014) Jour. Geol. Soc. Japan, vol.120, no.1, pp.1-9 DOI
• 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.)