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Akasawa Mud Member (Kuroda, 1966)

Invalid synonym: Takatoyo Member

• Type locality: Ikobe, Toyohashi city, Aichi prefecture
• Coherent formation
• middle Pleistocene (MIS 12 - 11)

• Sedimentary facies (Upper): Marine
• Sedimentary facies (Lower): Brackish
• Sedimentary facies (Top): Bay mouth
• Sedimentary facies (Upper): Closed bay
• Sedimentary facies (Middle): Drowned valley
• Sedimentary facies (Lower): River mouth, Lagoon
• Lithofacies: Silt, Sandy mud
• Lithofacies (Basal): Sandy silt, Muddy sands

• Upper limit: Transitional (Toshima Sand and Gravel Member, Kanbe Gravel Member)
• Lower limit: Transitional (Ikobe Gravel Member)

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

• Distribution: Ikobe - Nishinanane town - Nishiakasawa town - Higashiakasawa town, Toyohashi city, Aichi pref.; Gumihara - Nishihamada, Mutsure town, Tahara city, Aichi pref.
• Fossils: Ray (Rhinoptera sp.), Fishes (Chrysophrys major, Engraulis japonicus), Insects (Bibio sp.), Echinoids, Starfishes, Soritary corals, Foraminifera, Trace fossils
• Fossils (Shellfish): Corbicula japonica, Crassostrea gigas, Dosinia troscheli, Mya japonica, Raetellops pulchellus, Theora lubrica, Trapezium liratum
• Fossils (Plants): Abies firma, Acer palmatum, Carpinus laxiflora, Castanopsis sieboldii, Illicium anisatum (Fruit), Mackilus thunbergii, Quercus glauca
• Fossils (Pollen): Acer sp., Fagus sp., Quercus sp., Ulmus sp., Zelkova sp.
• Fossils (Calcareous nannofossils): Gephyrocapsa sp.
• Fossils (Ostracods): Aurila subconvexa, Bicornucythere bisanensis, Cytheromorpha acupunctata, Spinileberis quadriaculeata
• Tephra: At-3up, At-3low

• Nakashima et al. (2008) Geology of the Toyohashi and Tahara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 113p. (in Japanese with English abstract 3p.)
• Nakashima et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.70-79 DOI