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Osodani Unit (Kiminami et al., 1998) Hara et al., 2014

Invalid synonym: Osodani Formation, upper Akamatsu Formation

• Type locality: Osodani, Naka city, Naka county, Tokushima prefecture
• Accretionary complex
• Deposition (Mudstone): Cretaceous, Albian - Coniacian (Radiolarians)

• Sedimentary facies: Marine
• Lithofacies: Coherent facies
• Lithofacies (Minor): Broken facies
• Lithofacies: Interbedded sandstone and mudstone, Sandstone

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

• Distribution: Mugi city, Kaifu county, Tokushima pref.; Nagayasuguchi dam - Osodani - Minagawa river - Kaikawadani - Otanigawa river - Yutodani - Senbondani, Naga city, Naga county, Tokushima pref.; Sugikumagawa river, Kami city, Kochi pref.; Iokigawa river, Aki city, Kochi pref.
• Fossils (Radiolarians): Archaeodictyomitra squinaboli, Artostrobium tina, Dictyomitra formosa, Dictyomitra montisserei, Dictyomitra napaensis, Praeconocaryomma universa, Pseudoaulophacus praefloresensis, Pseudodictyomitra pseudomacrocephala, Pseudodictyomitra tiara, Rhopalasyringium mosquense, Stichomitra asymbatos, Stichomitra stocki, Thanarla pulchra, Thanarla veneta, Xitus mclaughlini

• Hara et al. (2014) Geology of the Kitagawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 4p.)
• Kiminami and Toda (2007) Jour. Geol. Soc. Japan, vol.113, no.4, pp.158-167 DOI