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Nagahama Sand and Gravel Member Kanehara, 1949

Invalid synonym: Sasage Formation

• Type locality: Nagahama, Futtsu city, Chiba prefecture
• Coherent formation
• Fore-arc basin sediments (Kazusa trough)
• Pleistocene
• Contemporaneous heterotopic facies: upper Mandano Formation

• Sedimentary facies: Basal conglomerate
• Sedimentary facies: Chennel-fill deposit
• Water temperatur (Upper)e: Warm ocean current
• Water temperature (Lower): Cold ocean current
• Depth of water (Upper): lower Sublittoral
• Depth of water (Lower): upper Sublittoral
• Lithofacies: Conglomerate
• Lithofacies (Minor): Sandstone
• Sedimentary structures (Basal): Channel structure

• Lower limit: Unconformity (Umegase Formation, Kokumoto Formation, Ichijiku Formation, Chonan Formation)

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

• Distribution: Nagahama, Futtsu city, Chiba pref.
• Fossils: Mammals (Parelephas trogontherii), Shellfishes
• Tephra: Ks15

• 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.)