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Okutone Group
- Coherent formation
- Late Triassic, Norian
- Intruded by: Sudagai Granite, Makihatayama Granodiorite, Echigosawa Porphyrite, Porphyrite, Andesite, Granophyre, Quartz porphyry, Rhyolite, Hornblende - biotite dacite, Miocene Quartz diorite
- Sedimentary facies: Marine
- Sedimentary facies: Continental shelf
- Lithofacies: Shale, Sandstone, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Gunma pref.; Mount Makihata - Mount Ushigatake, Minamiuonuma city, Niigata pref. - Minakami city, Tone county, Gunma pref.; Tone river - Nakanomata river, Gunma pref.; Mount Usagidake, Minamiuonuma city - Uonuma city, Niigata pref.; Nonaka creek - Ikazawa river, Nonaka, Minamiuonuma city, Niigata pref.; Mount Warimeki, Minamiuonuma city, Niigata pref.; Kitanomata river - Shimotsu river, Uonuma city, Niigata pref.
- Fossils: Entomonotis cf. ochotica, Entomonotis cfr. ochotica var. eurachis, Entomonotis tenuicostata var. mabara,
Monotis (Entomonotis) subcircularis, Monotis (Entomonotis) zabaikalica, Naticopsis sp.
- 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.)
- Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)
- Yanagisawa et al. (1985) Geology of the Tokamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 6p.)
- Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)