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Kakio Formation (Otsuka, 1932) Takano, 1994
Invalid synonym: Nara Formation
- Type locality: Manpukuji - Kamiasao, Asao ward, Kawasaki city, Kanagawa prefecture
- Coherent formation
- Fore-arc basin sediments (Kazusa trough)
- early Pleistocene (1.5 - 1.3 Ma)
- Interfingered: Inagi Formation, Dedana Formation, Ozenji Formation
- Sedimentary facies: Shallow marine
- Sedimentary facies: Inner bay
- Water temperature: Cold ocean current
- Lithofacies: Silt
- Sedimentary structures: Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Manpukuji -Asao, Asao ward, Kawasaki city, Kanagawa pref.; Kakio, Tama ward, Kawasaki city, Kanagawa pref.; Onda town, Aoba ward, Yokohama city, Kanagawa pref.; Nara town - Aobadai - Fujigaoka - Kawawa town - Ikebe town, Midori ward, Yokohama city, Kanagawa pref.; Tamagawagakuen - Miwa town - Nogaya, Machida city, Tokyo
- Fossils: Elephants, Fishes (Otoliths), Sharks (Teeth), Foraminifera, Diatoms
- Fossils (Shellfishes): Acila divaricata, Acila insignis, Anadara subcrenata, Barbatia uwaensis, Callista chinensis, Cancellaria spengleriana, Cardium muticum, Chlamis nipponensis, Clementia vatheleti, Crassatellites nanus, Cultellus izumoensis, Dentalium septentrionale, Dentalium weinkauffi, Dosinia troscheli, Dosinorbis japonica, Glycymeris rotunda, Glycymeris yessoensis, Limopsis crenata, Lucina acutilineata, Lucina eivica, Lucinoma annulata, Macoma incongrua, Nassarius caelatus, Natica janthostoma, Nucula insignis, Nucula japonica, Nuculana confusa, Nuculana gordonis, Ostrea gigas, Ostrea laperousi, Paphia schnelliana, Paphia smabilis, Pecten yessoensis, Phalium cf. strigatum, Polinices didyma, Protothaca adamsi, Raphia amabilis, Spisula sachalinensis, Tonna luteostoma, Turris cf. unedo, Turritella nipponica, Umbonium giganteum, Venericardia ferruginea
- Fossils (Plants): Cedroxylon sp., Celtis? sp., Cunninghamia konishi (Leaves), Cupressinoxylon spp., Davidia involucrata (Cones), Juglans cinerea (Cones), Juniperoxylon sp., Paliurus nipponicus (Cones), Pinuxylon spp., Taxodioxylon sequoianum
- Tephra: KK, YM, YU, PK, Ng-YR, H 1, Sm, Fr, Tr 1, Tr 2
- Suzuki et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.343-356, DOI
- Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
- Suzuki and Murata (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.379-397 DOI
- Oka et al. (1984) Geology of the Tokyo-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)