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Kuri Formation Imamura et al., 1958

Invalid synonym: Upper Tamatsukuri Formation, Sakura Formation

• Type locality: Kuri town, Oda city, Shimane prefecture
• Coherent formation
• middle Miocene (15.5 - 14.8 Ma, K-Ar)
• Correlation: Josoji Formation
• Intruded by: Diorite - Dolerite sills

• Sedimentary facies: Marine
• Sedimentary facies (Rhyolite): Submarine volcano?
• Depth of water: Shallow - Bathypelagic
• Lithofacies: Mudstone, Rhyolite lava, Tuff, Submarine pyroclastic flow deposit, Hyaloclastite

• Source (Rhyolite): Mount Bukyozan?
• Thickness: 200 - 500 m
• Upper limit: Unconformity (Omori Formation)
• Lower limit: Interfinggered (Kawai Formation), Conformity (Hata Formation)

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

• Distribution: Kuri town - Ushibaragawa river, Oda city, Shimane pref.; Mount Oyama - Mount Bukkyozan, Izumo city, Shimane pref.; Saso, Matsue city, Shimane pref.
• Fossils: Fish scales, Shellfishes (Portlandia cf. tokunagai), Radiolarians
• Fossils (Foraminifera): Globigerina angustiumbilicata, Globigerina praebulloides, Globigerinita glutinata, Praeorbulina sicana
• Fossils (Calcareous nannofossils): Helicosphaera ampliaperta, Sphenolithus heteromorphus, Cyclicargolithus floridanus

• Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
• Sawada et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.267-284 DOI
• Hayashi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.4, pp.300-311 DOI
• Sato et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.439-450 DOI
• Utada (2007) Jour. Geol. Soc. Japan, vol.113, no.8, pp.438-453 DOI
• Kano et al. (1991) Geology of the Imaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 5p.)