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Nm-SB Tephra

Abbr.: Nm-SB

• Volcanic rocks
• Late Pleistocene (0.13, 0.11 Ma, FT)
• Correlation: Shirifukitoge Pyroclastic Deposit

• Lithofacies: Rhyolitic pumiceous fall deposit
• Lithofacies: Volcanic ash

• Source: Numazawa volcano
• Mode of eruption: Plinian
• Host: Shimotsuke-Osawa Terrace Deposit
• Thickness: 6 - 21 cm

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

• Distribution: Saigo city, Nishishirakawa county,, Fukushima pref.; Lake Tsurugaike, Shimogo city, Minamiaizu county, Fukushima pref.; Fukushima city, Fukushima pref.; Imaichi city, Tochigi pref.

• Masubuchi and Ishizaki (2011) Jour. Geol. Soc. Japan, vol.117, no.6, pp.357-376 DOI
• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)
• 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.)