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Eboshiyama Formation Sugai, 1973
Invalid synonym: Tsugamine Group
- Type locality: Upper reaches of Koya river, Iide city, Nishiokitama county, Yamagata prefecture
- Accretionary complex
- Deposition: Jurassic?
- Accretion: Jurassic?
- Intruded by: Biotite tonalite
- Sedimentary facies: Marine
- Metamorphic facies: Amphibolite
- Lithofacies: Biotite hornfels
- Lithofacies (Minor): Mylonite
- Lithofacies (Protolith): Interbedded shale and sandstone
- Sedimentary structures: Low-angle cross stratification, Graded bedding
- Upper limit: Unconformity (Neogene)
- Ashio Belt (Iide city, Yamagata pref.)
- [ Upper ]
- /--/--/--/--/-
- Eboshiyama Formation
- /--/--/--/--/-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Koya river - Mount Eboshidake, Iide city, Nishiokitama county, Yamagata pref.
- Yanagisawa and Yamamoto (1998) Geology of the Tamaniwa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)