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Moriya Formation Honma, 1927

Invalid synonym: Katakura Member, Tateishi Member, Gongenzawa Member, Usuzawa Member

• Type locality: Nagano prefecture
• Coherent formation
• Miocene
• Intruded by: Hachibuse Quartz diorite, Jinguji Andesite, Hornblende pyroxene porphyry, Diorite porphyry
• Correlation (Upper): lower Uchimura Formation

• Sedimentary facies: Marine
• Metamorphic facies: Partly subjected to metamorphism by Hachibuse Quartz diorite and fault = Shimosuwa Metamorphic Rocks?
• Lithofacies (Upper): Tuff, Tuff breccia, Tuffaceous sandstone, Andesite
• Lithofacies (Lower): Conglomerate, Sandstone, Shale
• Lithofacies (Minor): Amphibole schist, Slate, Gneiss, Hornfels, Mylonite
• Paleocurrent: from Northeast

• Thickness: 2,200 m or thicker
• Upper limit: Unconformity (Enrei Volcanic Rocks, Arugatoge Body, Tsuetsukitoge Body)
• Lower limit: Abut unconformity (Ryoke Metamorphic Rocks)

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

• Distribution: Mount Hachibuse - Mount Takabocchi - Mount Futatsuyama, Okaya city, Nagano pref.; Mount Moriya, Suwa city - Ina city, Nagano pref.; Shimonohara, Shimosuwa city, Suwa county, Nagano pref.; Minamimajino, Konan, Suwa city, Nagano pref.; Mount Oizumiyama, Izumino, Chino city, Nagano pref.
• Fossils (Shellfishes): Acesta sp., Acila sp., Alloides succincta, Anadara chichibuensis, Anadara moriyensis, Angulus sp., Callista chinensis, Callista (Costacallista) mitagensis, Clementia moriyensis, Clinocardium cf. shinjiense, Crassatellites nanus, Cultellus otukai, Cyclina japonica, Cylichna sp., Dosinia fujimotoi, Felaniella cf. usta, Glycymeris? sp., Macoma cf. sejugata, Mactra sp., Malletia sp., Margarites eos, Mercenaria kurosawai, Mercenaria moriyensis, Modiolus sp., Monia macrochisma, Nassarius moriyensis, Neverita cf. didyma, Ostrea? sp., Oxyperas sp., Paphia hirabayashii, Periploma cf. yokoyamai, Pholadidea? sp., Pitar cf. matsumotoi, Pitar okadana, Saccella confusa, Saccella confusa kongiensis, Saccella cf. nagaoi, Searlesia deccessor, Siliqua cf. ryokamiensis, Siphonalia cf. modificata, Solen gouldi, Solen aff. grandis, Spisula? sp., Tectonatica janthostomoides, Trophonopsis sp., Turritella (Hataiella) chichibuensis, Venericardia (Cyclocardia) akagii, Venericardia (Cyclocardia) siogamaensis, Venerupis (Siratoria) microsiratori, Yoldia sagittaria

• Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
• Makimoto et al. (1996) Geology of the Takato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 6p.)
• Sawamura and Owa (1953) Suwa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 4p.)