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Kiyosumi Formation Wakimizu, 1901
Invalid synonym: Kiyosumi Sandstone Formation, Inakozawa Formation, Inakozawa Mudstone Formation
- Sedimentary facies: Marine
- Sedimentary facies: Continental slope (Foraminifera)
- Sedimentary facies: Submarine fan
- Depth of water: Lower middle bathyal (Benthonic foraminifera)
- Lithofacies: Turbidite
- Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (North, Upper): Tuffaceous sandy siltstone
- Lithofacies (North, Lower): Siltstone
- Lithofacies (North, Minor): Tuff, Scoria
- Sedimentary structures: Graded bedding, Parallel stratificaiton, Cross stratification, Current ripples
- Sedimentary structures (Bottom): Slump deposit
- Sedimentation rate: 31.2 - 75.6 cm/k.y.
- Paleocurrent: North to Southwest, South, Southeast
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Kiyosumiyama - Fukurokura river, Kamogawa city, Chiba pref.; Aikawa - Takeoka, Futtsu city, Chiba pref.; Koito river, Toyofusa, Kimitsu city, Chiba pref.; Isumi river, Isumi city, Chiba pref.; Okitsu, Katsuura city, Chiba pref.
- Fossils: Foraminifera
- Fossils (Calcareous nannofossils): Amaurolithus tricomiculatus, Amaurolithus spp., Calcidiscus leptoporus, Calcidiscus macintyrei, Ceratolithus spp., Coccolithus pelagicus, Discoaster brouweri, Discoaster pentaradiatus, Discoaster surculus, Discoaster variabilis, Florisphaera profunda, Gephyrocapsa spp., Helicosphaera carteri, Reticulofenestra pseudoumbilicus, Reticulofenestra spp., Sphenolithus spp., Sphenolithus abies, Umbilicosphaera spp.
- Fossils (Radiolarians): Stichocorys pylomaticus, Stichocorys delmontensis, Stichocorys peregnina, Didymocyrtis penultima, Lithopera bacca
- Tephra: Ky1, Ky2, Ky3, Ky4, Ky5, Ky6, Ky7, Ky8, Ky9, Ky10, Ky11, Ky12, Ky13, Ky14, Ky15, Ky16, Ky17, Ky18, Ky19, Ky20, Ky21, Ky22, Ky23, Ky24, Ky25, Ky26, Ky27, Ky28, Ky29, Ky30, Ky31, Ky32, Ky33
- Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.375-395, DOI
- Kokado et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.10, pp.359-372, DOI
- Uramoto and Seike (2013) Jour. Geol. Soc. Japan, vol.119, no.10, pp.693-698 DOI
- Kameo et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.10, pp.563-574 DOI
- Sawada et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.5, pp.206-222 DOI
- Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)
- Suzuki et al. (1990) Geology of the Nago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 3p.)
- Nakajima et al. (1981) Geology of the Kamogawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 7p.)