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Nt-I Tephra Akutsu, 1955

Abbr.: Nt-I

• Type locality: Shichihonzakura, Imaichi city, Tochigi prefecture
• Tephra
• by a series of volcanic activity with Nt-S
• Pleistocene (13 - 12 ka, ¹⁴C)

• Lithofacies: Lapilli

• Source: Nantai volcano
• Mode of eruption: Plinian
• Host: Shimotsuke-Osawa Terrace Deposit, Tawara Loam
• Thickness: 1 m or thicker

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

• Distribution: Shichihonzakura, Imaichi city, Tochigi pref.; Omuro - Noguchi, Nikko city, Tochigi pref.; Imaichi alluvial fan, Imaichi city, Tochigi pref.; Ishinada town, Utsunomiya city, Tochigi pref.; Mount Ryujin, Yasato, Ishioka city, Ibaraki 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.)
• Miyazaki et al. (1996) Geology of the Makabe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 4p.)