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Obama Formation

• Type locality: Choshi, Chiba prefecture
• Coherent formation

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

• Distribution: Chosi, Chiba pref.

• Kashiwagi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.9, pp.647-652 DOI
• Suzuki and Murata (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.379-397 DOI