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Tonoiri Formation (Hashimoto, 1941) Kudo et al., 2011
Invalid synonym: Kamabuchi Conglomerate, lower Tsugawa Formation, lower Otanigawa Formation, lower Takayanagi Formation, Yamaya Formation
- Type locality: Tonoiri creek, Noshiro river, Kamitokura, Gosen city, Niigata prefecture
- Coherent formation
- early Miocene (18.0, 16.8 Ma, FT)
- Correlation: lower Kiyotsu Formation
- Intruded by: Rhyolite, Dolerite, Basalt, Andesite
- Sedimentary facies: Terrestrial
- Sedimentary facies (Minor): Marine
- Sedimentary facies: Braided river, Alluvial fan, Fan-delta
- Sedimentary facies: Flood plain, Channel deposit, Debris flow deposit
- Lithofacies: Conglomerate, Sandstone, Mudstone
- Lithofacies (Minor): Rhyolite lapilli tuff, Tuff breccia, Tuff, Lignite
- Sedimentary structures: Convolute lamination
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kamitokura - Amidase - Mount Echigo-Hakusan - Mount Hozoyama - Kadohara, Gosen city, Niigata pref.; Omata river - Mount Awagatake - Shizukawa river, Kamo city, Niigata pref.
- Fossils: Plants
- Tephra: Amidase Pyroclastic Flow Deposit
- 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.)