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Ryozensan Formation (Miyamura et al., 1976) Harayama et al., 1989

Invalid synonym: Fujiwaradake Formation

• Accretionary complex
• Deposition (Limestone): early Permian (Fusulinids)
• Deposition (Chert): middle - late Permian (Radiolarians)
• Jurassic
• Correlation: Samegai Formation
• Intruded by: Koto Rhyolites, Suzuka Granite, Inugami Granite Porphyry

• Sedimentary facies: Marine
• Lithofacies: Limestone, Mafic lava, Pillow lava, Tuff
• Lithofacies (Minor): Chert, Mudstone

• Thickness: ca. 600 m
• Upper limit: Unconformity (Same Welded Tuff)
• Lower limit: Thrust fault (Ojigahata Formation, Ikuridani Group, Kiwada Formation, Buheitoge Formation, Yasugawa Group)

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

• Distribution: Akebihara, Koka city, Shiga pref.; Kaiwara - Hida - Ichinose - Mount Ryozensan - Mount Nabejiriyama, Taga city, Inukami county, Shiga pref.; Mount Ryuosan, Ritto city, Shiga pref.; Mount Nihonkoba - Samekotanigawa river - Mount Amagoidake - Kozuhata - Shibukawa river - Fujikawadani valley, Higashiomi city, Shiga pref.; Mount Fujiwaradake, Higashiomi city, Shiga pref. - Inabe city, Mie pref.; Kurakaketoge pass - Sakamoto - Mount Oikegatake, Inabe city, Mie pref.
• Fossils: Ammonoids (Metalegoceras? sp.), Brachiopods, Corals, Bryozoans
• Fossils (Limestone, Fusulinids): Biwaella omiensis, Misellina sp., Nagatoella sp., Neofusulinella giraudi, Nipponitella sp., Paraschwagerina (Acervoschwagerina) endoi, Paraschwagerina (Paraschwagerina) aff. kansaensis, Pseudofusulina ambigua, Pseudofusulina bacca, Pseudofusulina crassitectoria, Pseudofusulina cushmani, Pseudofusulina fusiformis, Pseudofusulina gümbeli, Pseudofusulina kraffti, Pseudofusulina kraffti var. magna, Pseudofusulina krotowi, Pseudofusulina modica, Pseudofusulina krotowi, Pseudofusulina nobilis, Pseudofusulina norikuraensis, Pseudofusulina okafujii, Pseudofusulina paragümbeli, Pseudofusulina reguralis, Pseudofusulina subtenuis, Pseudofusulina tenuis, Pseudofusulina teschernishewi, Pseudofusulina vulgaris, Pseudofusulina vulgaris var. globosa, Pseudofusulina vulgaris var. megaspherica, Pseudofusulina vulgaris var. watanabei, Pseudofusulina cf. yobarensis, Pseudoschwagerina robusta, Quasifusulina sp., Rugosofusulina alpina, Rugosofusulina cf. serrata, Schubertella borealis, Schubertella giraudi, Schubertella kingi, Schubertella minula, Schwagerina howkinsi, Schwagerina ibukiensis, Staffella yobarensis, Triticites biconica, Triticites ellipsoidalis, Triticites hydeni, Triticites isaensis, Triticites kowanoboriensis, Triticites noinskyi var. paula, Triticites obai, Triticites simplex, Triticites suzuki, Triticites tuntula
• Fossils (Radiolarians): Follicucullus scholastics

• Harayama et al. (1989) Geology of the Gozaishoyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 145p. (in Japanese with English abstract 6p.)
• Miyamura et al. (1976) Geology of the Hikonetobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 6p.)