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Hama Formation Otsuka, 1937
- Type locality: Nagahama, Kanazawa town, Kanazawa ward, Yokohama city, Kanagawa prefecture
- Coherent formation
- Fore-arc basin sediments (Kazusa trough)
- Correlation (Top): Mandano Formation
- Correlation: Chonan Formation
- Sedimentary facies: Freshwater
- Lithofacies (Top): Gravel-bearing sands
- Lithofacies (Upper): Sands-dominant interbedded sands and mud
- Lithofacies: Mud-dominant interbedded sands and mud
- Sedimentary structures (Top): Cross stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kanazawa town - Shiba town - Horiguchi - Tomioka town, Kanazawa ward, Yokohama city, Kanagawa pref.; Kaminakazato - Sugita town - Tanaka town, Isogo ward, Yokohama city, Kanagawa pref.
- Fossils (Diatoms): Melosira salcata, Synera ulna var. ramesi
- Suzuki and Murata (2011) Jour. Geol. Soc. Japan, vol.117, no.7, pp.379-397 DOI
- 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.)