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Senbatake Conglomerate Member Koike, 1949

Invalid synonym: Senbatake Formation

• Type locality: Shikomagawa river, Inakozawa, Futtsu city, Chiba prefecture
• Coherent formation
• Forearc basin sediments
• Miocene (ca. 7 Ma)
• Correlation: Tagoegawa Sandstone and Conglomerate Member

• Sedimentary facies: Shallow marine
• Sedimentary facies: Inner bay
• Sedimentary facies: Tidal zone, Upper sublittoral, Middle bathyal (Shellfishes)
• Lithofacies: Sandstone, Conglomerate
• Sedimentary structures: Cross stratification

• Thickness: 0 - 43 m
• Lower limit: Unconformity (middle Amatsu Formation, Iwaibukuro Formation)

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

• Distribution: Inakozawa - Senbatake - Kanaya - Shikumi, Futtsu city, Chiba pref.; Motona - Cape Myogane, Kyonan city, Awa county, Chiba pref.
• Fossils: Mammalia (Elephants), Sharks (Isurus hastalis), Echinoides (Echinolampas yoshiwarai), Foraminifera
• Fossils (Shellfishes): Aequipecten vesiculosus, Amussiopecten akiyamae, Balanus cf. coriosus, Chlamys kakisakiensis, Dentalium weinkauffi, Dosinia cf. pubescens, Glycymeris cf. vestitoides, Lima sp., Limatula cf. subauriculata, Miyagipecten matsumoriensis, Portlandia cf. japonica, Spisula sp., Trochus sp., Venus sp.

• Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.375-395, 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.)