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Hayashi Formation (Koike and Murai, 1950) Eto et al., 1998

• Type locality: Hayashi, Yokosuka city, Kanagawa prefecture
• Coherent formation
• Fore-arc basin sediments (Kazusa trough)
• Pleistocene
• Correlation: Imaizumi Sandstone and Conglomerate Member

• Lithofacies: Pumiceous - Scoriaceous sands, Gravels
• Lithofacies (Minor): Tuff breccia
• Lithofacies (Basal): Breccia

• Thickness: 12 - 25 m
• Upper limit: Uncoformity (Miyata Formation)
• Lower limit: Unconformity (Hayama Group)

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

• Distribution: Hayashi - Okine, Yokosuka city, Kanagawa pref.
• Fossils (Shellfishes): Ammusiopecten sp., Chlamys sp., Mizuhopecten sp.

• Eto et al. (1998) Geology of the Yokosuka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 3p.)