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Amazakai Pyroclastic Flow Deposit

• Tephra
• Pleistocene

• Sedimentary facies: Lacustrine
• Lithofacies: Hornblende andesite pyroclastic rocks (4 flow units)
• Lithofacies (Minor): Gravels, Clay

• Thickness: 20 - 40 m
• Upper limit: Unconformity (Kyowa-Bokujo Lavas, Ryugamine Lavas)
• Lower limit: Unconformity (Tatamiishi Lava, Uyamasegi Lava, Nagato Lavas, Kasuga Volcanic Rocks, Hosokojigawa Lava)

• Distribution: Naruishi - Amazakai - Uyamasegi - Shiozawasegi, Tateshina city, Kitasaku county, Nagano pref.; Hacchoji river - Karasawa - Kanayama - Oki - Hosokoji river, Saku city, Nagano pref.; Hotokeiwa, Nagawa city, Chiisagawa county, Nagano pref.

• Kawachi and Aramaki (1979) Geology of the Komoro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 39p. (in Japanese with English abstract 2p.)
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)