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Yukawa Formation

• Forearc basin sediments
• Late Cretaceous, late Albian - Coniacian (Radiolarians)

• Sedimentary facies: Marine
• Sedimentary facies: Continental shelf, Upper continental slope
• Lithofacies (Upper): Mélange facies
• Lithofacies (Lower): Coherent facies
• Matrix: Mudstone
• Lithofacies (Coherent facies): Sandstone, Sandstone-dominant interbedded sandstone and shale
• Lithofacies (Coherent facies, Minor): Shale-dominant interbedded sandstone and shale, Felsic tuff
• Sedimentary structures: Upward-coarsening

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

• Distribution: Kamiya, Yura city, Hidaka county, Wakayama pref.; Aridagawa city, Arida county, Wakayama pref.

• Ota et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.5, pp.329-347 DOI
• Shimura et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.11, pp.925-937 DOI
• Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI
• Tomiyoshi and Takasu, (2009) Jour. Geol. Soc. Japan, vol.115, no.10, pp.540-543 DOI
• Tokiwa et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.6, pp.270-273 DOI
• Win et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.4, pp.133-145 DOI