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Ushiroyama Member Tanaka et al., 1962
- Type locality: Tanashi river, Ushiroyama, Suwa city, Nagano prefecture
- Volcanic rocks
- middle Miocene
- Sedimentary facies: Marine
- Sedimentary facies: Continental slope (Foraminifera)
- Lithofacies: Mudstone
- Lithofacies (Upper, Minor): Sandstone, Tuffaceous sandstone
- Sedimentary structures: Parallel stratification, Ripple foliation
- Moriya Formation
- [ Upper ]
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- Karasawagawa Member
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- Kumakubo Member
- '''''''/,,,,,,
- Takabe Member
- '''''''/,,,,,,
- Ushiroyama Member
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- Tanashigawa Member
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- Furuyashiki Member
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- Usuzawa Member
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- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Tanashi river, Ushiroyama, Suwa city, Nagano pref.; Furuyashiki - Katakura, Takato, Ina city, Nagano pref.
- Fossils (Shellfishes): Anadara moriyensis, Callista chinensis, Clementia moriyensis, Felaniella cf. usta, Macoma cf. sejugata, Margarites eos, Mercenaria kurosawai, Mercenaria moriyensis, Monia macrochisma, Pitar okadana, Saccella confusa kongiensis, Saccella cf. nagaoi, Searlesia deccessor, Solen sp., Spisula? sp., Tectonatica janthostomides, Trophonopsis sp., Turritella (Hataiella) chichibuensis
- Fossils (Foraminifera): Cribrostomoides sp., Cyclammina pusilla, Globigerina praebulloides, Globigerinoides sicanus, Globigerinoides triobus, Globorotalia praescitura, Miogypsina kotoi
- 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.)