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Omachi APm Tephra

Abbr.: APm

Invalid synonym: Crystal ash, Miho Pumice

• Tephra
• middle Pleistocene (0.86 - 0.52 Ma, FT)
• Correlation: Nemoto 13, Nemoto 14, TE-5?, HBP, Okuhida Pyroclastic Flow Deposit

• Lithofacies: Crystalline volcanic ash

• Host: Lower Tephra, Taniage Loam, Biotite Loam, Kitahata Landslide Deposits, Kataoka Gravel

• Source: Suiendani Vent
• Thickness: 30 cm

• Distribution: Joetsu area, Niitaga pref. - Kanto region - Fukushima pref.
• Distribution: Uchiyama shrine, Kijimadaira city, Shimotakai county, Nagano pref.; Okayama - Jorokudaira, Iiyama city, Nagano pref.

• Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)
• Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)
• Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)
• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)