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Nomuragawa Basalt Kobayashi et al., 2004

Invalid synonym: Sugoroku Basalt

• Type locality: Upper reaches of Nomura river, Oga city, Akita prefecture
• Type locality (Sub): Sugorokusawa river, Oga city, Akita prefecture
• Volcanic rocks
• early Miocene (20.9, 19.1 Ma, K-Ar)

• Lithofacies: Tholeiitic
• Lithofacies: Clinopyroxene olivine basalt, Olivine basalt, Olivine-bearing orthopyroxene clinopyroxene basaltic andesite
• Lithofacies: Aa lava, Block lava, Volcanic conglomerate, Tuff breccia

• Thickness: 150 - 250 m
• Upper limit: Conformity (Nomuragawa Dacite II), Onlap unconformity (Daijima Formation), Abut unconformity (Tateyamazaki Dacite)
• Lower limit: Conformity (Nomuragawa Dacite I), Unconformity (Shinzan Rhyolite)Unconformity? (Nagasaki Dacite)

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

• Distribution: Oga peninsula, Akita pref.
• Distribution: Upper reaches of Nomura river, Oga city, Akita pref.; Cape Tateyamazaki - Cape Shiosenomisaki - Sugoroku river - Sugorokugaw river, Oga city, Akita pref.; Taki river, Oganaka, Oga city, Akita pref.; Daijima, Oga city, Akita pref.

• 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