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R4

• Type locality: Hidakagawa river, Ryujin town, Tanabe city, Wakayama prefecture
• Accretionary complex
• Late Cretaceous
• Correlation: Rb, lower Ru

• Sedimentary facies: Marine
• Lithofacies: Sandstone dominant interbedded sandstone and shale
• Lithofacies (Minor): Sandstone
• Sedimentary structures: Sole marks
• Paleocurrent (Longitudinal current flow): to West-southwest

• Thickness: 110 - 310 m

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

• Distribution: Hidakagawa river - Ryujin hotspring - Komatagawa river - Mount Ushimawariyama - Mukaisedani? valley - Koyabugawa river - Masakidani valley - Mount Otogeyama, Ryujin town, Tanabe city, Wakayama pref.; Kotsumose - Miyanohira, Totsukawa city, Yoshino county, Nara pref.
• Fossils (Radiolarians): Amphipyndax stocki, Amphipyndax sp., Archaeodictyomitra ssp., Dictyomitra formosa, Patulibracchium sp.,

• Tokiwa et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.6, pp.270-273 DOI
• Tokuoka et al (1981) Geology of the Ryujin District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 6p.)