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Lower Nanakura Tuff Member Chitani, 1928
- Type locality: Komagata, Futatsui town, Noshiro city, Akita prefecture
- Volcanic rocks
- Pliocene - Pleistocene
- Correlation: Moyasan Rhyolite
- Lithofacies: Pyroxene-bearing hornblende biotite rhyolite, Dacite
- Lithofacies (Upper): Banded pumice tuff
- Lithofacies (Lower): Massiv pumice tuff
- Lithofacies (Minor): Volcanic lapilli tuff, Tuff breccia, Mudstone
- Funakawa Formation (Futatsui - Fujisato)
- [ Upper ]
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- Upper Nanakura Tuff Member
- '''''''/,,,,,,
- Main part
- '''''''/,,,,,,
- Lower Nanakura Tuff Member
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Futatsui town, Noshiro city - Fujisato city, Yamamoto county, Akita pref.; Hiyama - Hadachi, Noshiro city, Akita pref.
- Fossils: Whales (Ribs)
- Murakami et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.111-120 DOI
- 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.)
- Ozawa et al. (1984) Geology of the Noshiro District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 9p.)
- Hirayama and Sumi (1963) Takanosu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 7p.)
- Sumi et al. (1962) Dairakozan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 51p. (in Japanese with English abstract 7p.)