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R3

• Type locality: Hidakagawa river, Ryujin town, Tanabe city, Wakayama prefecture
• Accretionary complex
• Late Cretaceous
• Correlation (Upper): Ra
• Correlation (Lower): Rc, upper Ru

• Sedimentary facies: Marine
• Lithofacies: Shale
• Lithofacies (Minor): Shale dominant interbedded sandstone and shale, Sandstone, Acidic tuff, Greenstones

• Thickness: ca. 230 - 1,400 m

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

• Distribution: Hidakagawa river - Miyashiro - Mukaisedani? valley - Orikawadani valley - Komatagawa river - Kitamatadani valey, Ryujin town, Tanabe city, Wakayama pref.; Shigesato - Furutanigawa river - Mount Maruoyama - Matsubashiradani valley, Totsukawa city, Yoshino county, Nara pref.
• Fossils (Radiolarians): Amphipyndax pseudoconulus, Amphipyndax stocki, Amphipyndax sp., Archaeodictyomitra ssp., Dictyomitra formosa, Dictyomitra sp., Lithocampe wharanui, Lithomelissa heros, Myllocercion aff. echtus, Xitus grandis

• 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.)