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Manaitayama Volcanic Rocks Inoue et al., 1956

Invalid synonym: Nise Tuff, Manaitayama Volcanics Complex

• Type locality: Mount Manaita, Akita city, Akita prefecture
• Volcanic rocks
• Miocene (middle Onnagawa stage - middle Funakawa stage)
• Correlation: Himegatake Andesite, Shinzan Andesites

• Lithofacies: Hypersthene augite andesite lava, Tuff breccia, Volcanic breccia, Lapilli tuff, Olivine pyroxene andesite volcanic lapilli tuff, Tuff breccia
• Lithofacies (Minor): Basalt sill, dyke, Mudstone, Acidic tuff, Tuffaceous sandstone

• Thickness: 0 - 800 m
• Distribution (East-West): 15 km
• Distribution (North-South): 8 km
• Upper limit: Interfingered (Onnagawa Formation, Funakawa Formation), Conformity (Tentokuji Formation)
• Lower limit: Conformity (Sunagomata Formation (Hachiwari Formation))

• Distribution: Mount Manaita, Akita city, Akita pref.; Takinoshita, Gojome city, Minamiakita county, Akita pref.; Komata river, Kamishinjo, Akita city, Akita pref.

• Ozawa et al. (1985) Geology of the Moritake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 5p.)
• Huzioka et al. (1977) Geology of the Akita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 5p.)
• Hase and Hirayama (1970) Geology of the Gojome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 46p. (in Japanese with English abstract 6p.)