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Atosugiyama Formation Nagamori et al., 2010

• Type locality: 1,182 m above sea level, Tsunekurazawa creek, Mount Atosugiyama, Otari city, Kitaazumi county, Nagano prefecture
• Volcanic rocks
• Pliocene

• Lithofacies: Rhyolite welded lapilli tuff

• Thickness: ca. 800 m
• Lower limit: Abut unconformity (Ishizaka Formation)

• Distribution: Mount Atosugiyama - Komyo, Otari city, Kitaazumi county, Nagano pref.

• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Takeuchi et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.123-142 DOI