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Omachi Tephra Kobayashi et al., 1969

Invalid synonym: Omachi Loam

• Type locality: Omachi skii field, Omachi city, Nagano prefecture
• Loam
• middle Pleistocene

• Lithofacies:

• Source: Tateyama volcano
• Thickness: ca. 2 - 12 m
• Thickness (Upper): 1 - 3 m
• Thickness (Lower): ca. 1 m
• Upper limit: Unconformity (Omine Gravels)
• Lower limit: Unconformity (Haibara Formation, Ooka Mudflow Deposit, Hijiriyama Andesite, Mitsumineyama Volcanics, Oshio Pyroclastic Flow Deposit)

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

• Distribution: Omachi skii field, Omachi city, Nagano pref.; Lake Kogemiike - Karuizawa - Kodawara, Shinko town, Nagano city, Nagano pref.; Kanbadaira - Kobuji temple, Ooka, Nagano city, Nagano pref.; Shinjizo pass - Inaba, Toyosaka, Nagano city, Nagano pref.; Hijirikogen, Omi city, Higashichikuma county, Nagano pref.; Mount Jukkanzan, Aoki city, Chiisagata county, Nagano pref.; Mount Kyodaisan, Ueda city - Chikuma city - Sakaki city, Hanishina county, Nagano pref.; Chichibu city - Hanno city, Saitama pref.; Hachioji city, Tokyo; Mount Myokosan - Tokamachi city, Niigata pref.

• Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
• 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.)