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Idaira Formaiton

• Coherent formation
• Early Cretaceous Barremian

• Lithofacies: Slate, Sandstone
• Lithofacies (Minor): Conglomerate, Chert, Limestone

• Lower limit: Unconformity (Chichibu Belt)

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

• Distribution: Shizuoka pref.
• Fossils (Lower, Ammonoids): Crioceratites (Paracrioceras) asiaticum

• Terabe and Matsuoka (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.130-140 DOI
• Saito (1955) Mikawa-Ono, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 36p. (in Japanese with English abstract 11p.)