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Setogawa Group (Chitani, 1931) Sugiyama, 1995

Invalid synonym: Narata Formation, Amehatagawa Group

• Accretionary complex
• Deposition (Limestone): middle Eocene - early Oligocene
• Deposition (Chert): Oligocene - early Miocene
• Deposition (Basalt): Eocene, early Miocene
• Deposition (Clastic rocks): early Miocene
• Accretion: ealy Miocene (20 Ma)
• Correlation: Mineoka Group
• Intruded by: Kaikoma Granite, Amehata Granite, Serpentinite, Gabbro, Dolerite, Basalt, Granodiorite, Diorite

• Sedimentary facies: Marine
• Sedimentary facies: Oceanic plate accreted to trench slope at the continental side, Trench-fill deposit
• Lithofacies (Top): Sandstone, Interbedded sandstone and shale
• Lithofacies (Upper): Shale
• Lithofacies (Middle): Chert
• Lithofacies (Lower): Limestone
• Lithofacies (Bottom): Basalt lava, Hyaloclstite
• Lithofacies (Minor): Tuffaceous shale, Felsic tuff, Serpentinite

• Thickness (Clastic rocks): ca. 2,800 m
• Thickness (Basalt): ca. 400 m
• Distribution (South-North): ca. 100 km
• Distribution (Width): ca. 2 - 8 km
• Upper limit: Unconformity (Mikasa Group, Sagara Group)

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

• Distribution: Hayakawa river - Harukigawa river - Amehatagawa river - Uchikochigawa river - Hogawa river - Mount Shichimensan, Hayakawa city, Minamikoma county, Yamanashi pref.; Shizuoka pref.
• Fossils (Limestone): Bryozoans, Calcareous algae, Foraminifera, Radiolarians, Calcareous nannofossils
• Fossils (Radiolarians): Actinomma? sp., Actinommidiae, Amphisphaera? sp., Calocyclas? sp., Calocycletta? sp., Carpocanistrum sp., Cyrtocupsella cornuta, Cyrtocapsella cf. tetrapera, Dendrospyris sp., Didymocyrtis? sp., Eucyrtidium sp., Larcopyle? spp., Liriospyris? sp., Lithelius ? spp., Lychnocanoma sp., Nassellaria, Periphaena? sp., Podocyrtis helenae, Podocyrtis cf. sinuosa, Prunopyle? spp., Sethocyrtis? sp., Spireuma? sp., Spongodiscus spp., Spongurus spp., Spumellaria, Stichocorys? sp., Stylatractus? sp., Stylochlamidium? sp., Stylosphaera? spp., Teoperidae, Thyrsocyrtis? sp.

• Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)
• Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)
• Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
• Sugiyama et al. (1982) Geology of the Shizuoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 9p.)