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Kuguriiwa Lavas Matoba et al., 1989

Corresponds to Butaijima Basalt, Ryugashima Dacite, Chorakuji Basalt, Nagasaki Dacite and Kenashiyama Andesite.

• Distribution: Daijima, Oga city, Akita pref.; Cape Nyudo - Toga bay, 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.)
• Sato et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.1, pp.31-46 DOI
• Fujimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.51-74 DOI