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Nk-SO Tephra Koike, 1977

Abbr.: Nk-SO

• Tephra
• Pleistocene

• Lithofacies: Lapilli

• Source: Nikko volcanos
• Host: Hoshakuji Loam
• Thickness: ca. 5 - 24 cm

• Distribution: IUHW Hospital, Higashiakada, Nasushiobara city, Tochigi pref.

• 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.)