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Sorayama Formation (Kamei, 1952) Igo, 1956

Invalid synonym: Murakami Conglomerate, Osobudani Conglomerate

• Type locality: Ichinotani - Kashiatedani valley, Fukuji, Okuhidaonsengo, Takayama city, Gifu prefecture
• Coherent formation
• Silurian - Permian
• Intruded by: Takidani Granodiorite, Diabase, Pyroxene gabbro

• Sedimentary facies: Marine
• Lithofacies: Basalt - Andesite lava, Pillow lava, Volcanic breccia, Tuff breccia, Lapilli tuff, Tuff
• Lithofacies (Minor): Sandstone, Mudstone, Siltstone, Limestone

• Upper limit: Unconformity (Nyukawa Pyroclastic Flow Deposit, Fukuji Tuff Breccia, Fukadani Debris Flow Deposit, Lower pyroclastic flow deposit, Iwatsuboyama Lava, Upper pyroclastic flow deposit)

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

• Distribution: Ichinotani - Kashiatedani valley - Mount Sorayama - Osobudani valley - Ippomizu - Uejigane - Iwatsubodani valley - Hotakadaira, Fukuji, Okuhidaonsengo, Takayama city, Gifu pref.
• Fossils: Radiolarians
• Fossils (Limestone): Corals (Favocites sp., Heliolites sp.), Fusulinids (Quasifusulina sp., Russiella sp., Triticites sp.)

• Suzuki et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.4, pp.307-322 DOI
• Tazawa et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.127-133 DOI
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)