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Oshio Pyroclastic Flow Deposit Kawachi et al., 1967

Invalid synonym: Kitayama Pumice Flow Deposit

Different geological unit from Oshio Pyroclastic Flow Deposit (Kato et al., 1989) in Omachi area, Nagano pref.

• Tephra
• Pleistocene (24.6 ka, ¹⁴C)

• Lithofacies: Mudflow-like reworked deposit
• Lithofacies (Lower): Hornblende-bearing hypersthene augite andesite pumice flow deposit (4 flow units)

• Source: Yatsugatake volcano
• Thickness: 3 m

• Distribution: Toyohira - Kohigashi - Kitayama - Kakumyo river - Naruiwa river - Mount Oizumiyama - Shimotsukinoki, Chino city, Nagano pref.

• Makimoto et al. (1996) Geology of the Takato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 6p.)