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Shiiya Formation (Iki, 1922) Omura, 1927
Invalid synonym: Higashiyama Formation
- Type locality (Original): Cape Kannon, Shiiya, Kashiwazaki city, Niigata prefecture
- Type locality (New): Gomoto river, Teradomari, Kashiwazaki city, Niigata prefecture
- Coherent formation
- Submarine fan
- late Miocene - early Pliocene (6.28 - 5.08 Ma, FT)
- Contemporaneous heterotopic facies: Kakuma Formation
- Correlation: Nakanomata Member, lower Kawazume Formation, Oshimizu Formation, Takegahana Formation, Hijirigahana Formation, Sugawa Formation, Mugurazawa Formation?, Nishitajiri Formation, Nechi Formation, Tomikura Formation
- Sedimentary facies: Marine
- Sedimentary facies (Upper): Channel-fill deposit at the upper fan, Levee deposit
- Sedimentary facies: Proximal fan-delta deposit
- Sedimentary facies: Trough-fill turbidite
- Sedimentary facies (Minor): Submarine debris flow
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (Minor): Sandstone, Gravel-bearing mudstone
- Sedimentary structures: Graded bedding, Sole marks, Bioturbation, Slump structures, Climbing ripples, Convolute foliation
- Paleocurrent: North
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Kannon, Shiiya, Kashiwazaki city, Niigata pref.; Otsu, Nishiyama town - Hirai, Kashiwazaki city, Niigata pref.; Inohana - Oginojo castle, Izumozaki city, Santo county, Niigata pref.; Yamada - Gomoto - Benzaiten, Teradomari, Nagaoka city, Niigata pref.; Kugami, Tsubame city, Niigata pref.; Terao, Kariwa city, Kariwa county, Niigata pref.
- Fossils (Foraminifera): Ammobaculites cf. formosensis, Ammodiscoides japonica, Cibicides sp., Cribrostomoides compressum, Cribrostomoides cf. emaciatum, Cribrostomoides cf. subglobosum, Cribrostomoides trullissatum, Cribrostomoides renzi, Cyclammina cancellata, Cyclammina japonica, Cyclammina pusilla, Geesella schnckii, Globigerina pachyderma, Globobulimina auriculata, Goesella schencki, Martinottiella communis, Melonis sp., Miliammina echigoensis, Nonion sp., Pseudoglobobulimina pupoides, Reophax excentricus, Saccammina sphoerica, Sphaeroidina bulloides, Spiroplectamina niigataensis, Trochamina sp.
- Fossils (Radiolarians): Lychnocanium nipponicum, Sethocyrtis japonica, Spongodiscus spp., Stichocorys delmontensis
- Tephra: Gtp, Km, Nlg, Obp, Obg, Jsp, Nob, Cpl, Ckz, Job, Cbg
- Takano (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.238-258 DOI
- Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.11, pp.XVII-XVIII
- Kobayashi et al. (2002) Geology of the Sanjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 98p. (in Japanese with English abstract 4p.)
- Kobayashi et al. (1995) Geology of the Kashiwazaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 4p.)
- Kobayashi et al. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)