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Nagasaki Dacite Kobayashi et al., 2008

A part of Kamo Lavas and Kuguriiwa Lavas.

• Type locality: Nagasaki, Shibikawa, Iriai, Oga city, Akita prefecture
• Volcanic rocks
• Submarine volcano complexes, Scoria cone
• Eocene - Oligocene (35.5, 27.1 Ma, FT)

• Sedimentary facies: Marine
• Lithofacies: Welded tuff (Volcanic ash flow deposit)
• Lithofacies (North): Dacite volcanic lapilli tuff
• Lithofacies (North, Minor): Tuffaceous sandstone
• Sedimentary structures: cross stratification

• Thickness: 20 - ca. 100 m
• Upper limit: Conformity (Kenashiyama Andesite) Unconformity? (Shinzan Rhyolite, Nomuragawa Basalt)
• Lower limit: Conformity (Chorakuji Basalt)

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

• Distribution: Nagatoko - Sannomegata - Ogayama bokujo, 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
• Ohguchi et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.17-32 DOI