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Obata Formation

Invalid synonym: Idozawa Formation

• Type locality: Tomioka city, Gunma prefecture
• Coherent formation
• Miocene (17 - 15 Ma)
• Correlation: Arakawa Formation, Tomita Formation, Oganomachi Formation

• Sedimentary facies: Marine
• Sedimentary facies: Turbidite
• Lithofacies: Interbedded sandstone and siltstone

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

• Distribution: Oshima, Tomioka city, Gunma pref.
• Fossils: Centrophorus sp. (Teeth)

• Tanaka et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.1, pp.17-24 DOI
• Suzuki (2007) Jour. Geol. Soc. Japan, vol.113, no.1, pp.23-26 DOI