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Kamihoshikawa Formation (Tokunaga et al., 1949) Mitsunashi and Kikuchi, 1982

Invalid synonym: Tachibana Group, Tachibana Formation

• Type locality: Kamihoshikawa, Hodogaya ward, Yokohama city, Kanagawa prefecture
• Coherent formation
• Fore-arc basin sediments (Kazusa trough)
• Contemporaneous heterotopic facies: Tsurukawa Formation, lower Koshiba Formation
• Correlation: Renkoji Formation, Inagi Formation, Ikuta Formation, Bushi Formation

• Lithofacies: Mudstone
• Lithofacies (Minor): Sands

• Thickness: ca. 170 m or thicker
• Upper limit: Conformity (Tsurukawa Formation, Nakazato Formation)

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

• Distribution: Kamihoshikawa, Hodogaya ward, Yokohama city, Kanagawa pref.; Katabiragawa river, Yokohama city, Kanagawa pref.; Miho town, Midori ward, Yokohama city, Kanagawa pref.; Kamikawai town, Asahi ward, Yokohama city, Kanagawa pref.; Isogo ward - Nka ward - Minami ward, Yokohama city, Kanagawa pref.
• Tephra: H 2, MT, Um

• 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.)
• Mitsunashi and Kikuchi (1982) Geology of the Yokohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 105p. (in Japanese with English abstract 4p.)