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Kuruma Group

• Type locality: Kuruma, Nagano prefecture
• Coherent formation
• Early Jurassic
• Correlation: Iwamuro Formation
• Intruded by: Kitamatadani Granodiorite, Andesite dykes

• Sedimentary facies: Shallow marine, Brackish, Terrestrial

• Upper limit: Unconformity (Mizukamidani Formation)
• Lower limit: Unconformity (Renge Metamorphic Rocks)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Kuruma, Otari city, Kitaazumi county, Nagano pref.; Mount Inugatake, Itoigawa city, Niigata pref. - Asahi city, Shimoniikawa county, Toyama pref.; Odokorogawa river, Itoigawa city, Niigata pref.
• Fossils: Dinosaur (Footprints), Ammonoids (Dictyophyllum sp.), Belemnites, Bivalves, Crinoids, Plants

• Takeuchi et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.5, pp.335-350 DOI
• Takeuchi et al. (2017) Geology of the Tomari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 121p. (in Japanese with English abstract 4p.)
• Takeuchi et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.7, pp.193-216, DOI
• Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
• Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)