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Ryugashima Dacite Kobayashi et al., 2008
A part of Kamo Lavas and Kuguriiwa Lavas.
- Type locality: Ryugashima island, Oga city, Akita prefecture
- Volcanic rocks
- Submarine volcano complexes, Scoria cone
- Eocene - Oligocene (31.5, 29.8 Ma, FT; 27.1 Ma, K-Ar)
- Sedimentary facies: Marine
- Sedimentary facies: Volcanic-fan deposit
- Lithofacies: Trachyte, Dacite, Rhyolite lava
- Lithofacies (North, Minor): Volcanic breccia, Tuff breccia (Block-and -ash flow deposit), Pumice volcanic lapilli tuff (Pumice flow deposit), Tuffaceous conglomerate, Sandstone (Lahar deposit)
- Lithofacies (South, Minor): Andesite, Rhyolite
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ryugashima island, Oga city, Akita pref.; Shohama - Kamo Aosa, Toga, - Monzen, Honzan, Funagawaminato, 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