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Azumagawa Rhyolite Member Moritani and Uemura, 1964 (Photo)
Invalid synonym: Rokkakuzawa Tuff
Host of bedded Mn deposits
- Type locality: Azuma river, Fukaura city, Nishitsugaru county, Aomori prefecture
- Volcanic rocks
- middle Miocene
- Sedimentary facies: Terrestrial
- Sedimentary facies: Transgressive
- Lithofacies: Rhyolite - dacite lava, Pumice tuff, Lapilli tuff, Tuff
- Lithofacies (Minor): Tuff breccia
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Odose - Azuma river - Kiyotaki creek - Mount Sasanagare, Fukaura city, Nishitsugaru county, Aomori pref.; Kodoji river - Odoji river, Fukaura city, Nishitsugaru county, Apmori pref.; Senjojiki, Fukaura city, Nishitsugaru county, Aomori pref.
- Fossils: Silicified woods
- Fossils (Rokkakuzawa Tuff, Aniai-type flora): Abies sp., Tsuga sp., Carpinus sp.
- Fossils (Rokkakuzawa Tuff, Freshwater diatoms): Cyclotella sp., Stephanodiscus sp., Melosira sp.
- Fossils (Shellfishes): Glycymeris vestitoides, Monia sp., Chlamys cfr. kaneharai, Ostrea sp., Crassatellites sp., Venericardia siogamensis, Venericardia cfr. osawanoensis, Lucinoma cfr. otukai, Callista? sp., Dosinia nomurai, Cyclina sp., Phaxas sp.
- Hirayama and Uemura (1985) Geology of the Ajigasawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 86p. (in Japanese with English abstract 6p.)
- Moritani (1968) Geology of the Fukaura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)