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Nomuragawa Formation Kobayashi et al., 2004

• Type locality: Nomura river - Cape Tateyamazaki - Cape Shiose - Sugorokusawa river - Sugoroku river, Oga city, Akita prefecture
• Volcanic rocks
• early Miocene (22 - 19 Ma, K-Ar, FT)

• Lithofacies: Tholeiite basalt, Basaltic andesite, Dacite
• Lithofacies (Basalt): Lavas, Pyroclastic rocks
• Lithofacies (Basaltic andesite): Lavas, Pyroclastic rocks, Fall deposit, Surge deposit
• Lithofacies (Dacite): Lapilli tuff, Pyroclastic flow deposit
• Lithofacies (Bottom): Conglomerate, Sandstone, Siltstone

• Thickness: 500 m or thicker
• Source (Dacite): Tateyamamisaki caldera, Honzan volcanic vent
• Upper limit: Unconformity (Nishikurosawa Formation, Onnagawa Formation)
• Lower limit: Abut unconformity (Shinzan Rhyolite), Unconformity (Kamo Lavas, Monzen Formation)

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

• Distribution: Nomura river - northern flank of Mount Shinzan - Nomura river - Cape Tateyamazaki - Cape Shiose - Sugorokusawa river - Sugoroku river, Oga city, Akita pref.

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Kano et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.6, pp.351-364 DOI
• Kano et al. (2011) Geology of the Toga and Funakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.552-562 DOI
• Sato et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.1, pp.31-46 DOI
• Ohguchi et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.17-32 DOI
• Fujimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.51-74 DOI