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Asso Formation

• Type locality: Tanabe city, Wakayama prefecture
• Coherent formation
• Miocene (15 Ma, Foraminifera)

• Sedimentary facies: Marine
• Sedimentary facies (Upper): Continental shelf
• Sedimentary facies (Lower): Gravel-rich fan delta, Barrier islands, Offshore slope
• Lithofacies (North): Conglomerate, Mudstone, Siltstone
• Lithofacies (South): Siltstone

• Thickness: 170 - 930 m
• Upper limit: Conformity
• Lower limit: Unconformity (Otonashigawa Group)

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

• Distribution: Wakayama pref.

• Miyata et al., (2009) Jour. Geol. Soc. Japan, vol.115, no.9, pp.470-482 DOI