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Mikawa Group

• Accretionary complex
• Deposition (Limestone): Permian (Fusulinids)
• Deposition (Chert): Permian, Triassic (Conodonts)
• Deposition (Siliceous mudstone): Triassic (Radiolarians)
• Deposition (Mudstone): Early Jurassic (Radiolarians)
• Accretion: Jurassic (Radiolarians)
• Intruded by: Yasakakyo Granite, Quartz porphry dikes, Granite porphyry dikes

• Sedimentary facies: Marine
• Lithofacies: Hornfels
• Lithofacies: Mélange facies
• Matrix: Mudstone
• Exotic blocks (Crusts): Chert, Sandstone, Greenstones, Siliceous mudstone, Limestone

• Distribution (Width): 1.5 - 4 km
• Thickness: 1,000 - 2,000 m
• Upper limit: Unconformity (Miwa Formation)

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

• Distribution: Setonouchi - Ashitani - Idagawa - Koidagawa river - Kakinokibara - Shibukumagawa river - Naganoshimo - Funatsu, Iwakuni city, Yamaguchi pref.
• Fossils (Limestone): Neoschwagerina sp., Yabeina? sp.
• Fossils (Radiolarians): Canoptum spp., Parahsuum? sp., Triassocampe? sp.
• Fossils (Conodonts): Enantiognathus ziegleri, Epigondolella bidentata, Gnathodus sp., Gondolella sp., Hindeodella bogschi, Hindeodella multihamata, Neogondolella polygnathiformis, Neohindeodella sp., Spathognathodus sp., Xaniognathus tortilis

• Higashimoto et al. (1986) Geology of the Otake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)