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Amo Formation

• Collision type metamorphism by the subduction of Yangtze plate under Sino-Korea plate
• Intermediate metamorphic rocks
• Metamorphism: middle Permian - Middle Triassic

• Lithofacies: Hornblende biotite gneiss, Garnet hornblende biotite quartz gneiss, Garnet biotite gneiss
• Lithofacies (Minor): Biotite gneiss
• Lithofacies (Protolith): Muddy sandstone
• Lithofacies (Protolith, Minor): Limestone, Mafic- Medium volcanic rocks

• Upper limit: Transitional (Sangodani Formation), Conformity (Odorigawa Formation)
• Lower limit: Transitional (Ashitani Formation)

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

• Distribution: Natsutsubodani valley - Kamikodani - Miyagawa river, Miyagawa town, Hida city, Gifu pref.; Odorigawa river - Amo - Genda - Myogase, Kawai town, Hida city, Gifu pref.

• Nozawa et al. (1975) Geology of the Hida-Furukawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 9p.)