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Otani Formation (Hashimoto, 1941) Kudo et al., 2011
Invalid synonym: Upper Tsugawa Formation, Upper Otanigawa Formation, Upper Takayanagi Formation, Takayanagi Tuff Member
- Type locality: Takayanagi river, Kamitakayanagi, Kamo city, Niigata prefecture
- Coherent formation
- early - middle Miocene (17 - 15 Ma; 16.6 Ma, FT)
- Intruded by: Rhyolite, Dolerite, Basalt, Andesite
- Correlation: Anazawa Formation, upper Kiyotsu Formation
- Correlation (Lower): Yuzawa Formation
- Sedimentary facies: Marine
- Depth of water: Upper - Middle bathyal (Foraminifera)
- Lithofacies: Mudstone, Rhyolite volcanic breccia, Tuff breccia, Lapilli tuff, Basalt - andesite volcanic breccia, Tuff breccia, Lapilli tuff
- Lithofacies (Minor): Rhyolite volcaniclastic rocks, Basalt - Andesite volcaniclastic rocks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Takayanagi river, Kamitakayanagi, Kamo city, Niigata pref.; Kamitokura - Lake Kasabori - Mount Haigatake, Gosen city, Niigata pref.; Komade river, Kitaimogawa, Shitada, Sanjo city, Niigata pref.; Shizukawa river - Nanatani, Kamo city, Niigata pref.
- Fossils: Dinoflagellates
- Fossils (Foraminifera): Cyclammina sp., Haprophragmoides compressum, Hopkinsina morimachiensis, Hopkinsina shimboi, Martinottiella communis, Spirosigmoilinella compressa
- Tephra: Kmt
- Kudo et al. (2011) Geology of the Kamo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 162p. (in Japanese with English abstract 4p.)
- Kudo et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.5, pp.277-288 DOI
- Hiranaka et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.177-186 DOI
- Takahashi et al. (2004) Geology of the Suhara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 80p. (in Japanese with English abstract 4p.)