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Sennan Formation

• Coherent formation
• Pliocene - Pleistocene (ca. 3.0 Ma)
• Correlation: Lower Most part of Osaka Group

• Sedimentary facies: Fluvial, Lacustrine
• Lithofacies (Upper): Silt, Clay
• Lithofacies (Upper, Minor): Sands, Gravels
• Lithofacies (Lower): Sands, Gravels
• Lithofacies (Lower, Minor): Silt, Clay

• Thickness: ca. 5 - 200 m or thicker
• Thickness (Upper): ca. 120 m
• Thickness (Lower): ca. 80 m
• Upper limit: Top of the silt bed including Mitsumatsu Tephra
• Upper limit: Unconformity (Middle Terrace Deposits, Lower Terrace Deposits)
• Lower limit: Unconformity (Nabeyama Andesite, Izumi Group)

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

• Distribution: Tanigawa, Tanagawa - Fuke - Misaki park - Tannowa, Misaki city, Sennan county, Osaka pref.; Hata shrine - Izumitottori - Midorigaoka, Hannan city, Osaka pref.; Butsunami town, Izumi city, Osaka pref.; Shinge, Sennan city, Osaka pref.; Ushitakigawa river, Kishiwada city, Osaka pref.; Umehara - Kinomoto, Wakayama city, Wakayama pref.
• Fossils (Plants): Carya sp., Ginkgo biloba, Glyptostrobus pensilis, Juglans cinerea var. megacinerea, Keteleeria davidiana, Liquidambar formosana, Melliodendron sp., Metasequoia disticha, Nyssa sp., Picea koribai, Pinus fujii, Pseudolarix kaempferi, Sequoia sempervirens
• Tephra: Misaki, Tsuchimaru, Mizuma, Habutaki, Asashiro, Tsujido, Manoike, Shimogaito, Mitsumatsu

• Makimoto et al. (2004) Geology of the Kokawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 89p. (in Japanese with English abstract 4p.)
• Miyachi et al. (1998) Geology of the Osaka-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 113p. (in Japanese with English abstract 5p.)
• Miyata et al. (1993) Geology of the Wakayama and Ozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)
• Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)