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Toyokawa Formation

Invalid synonym: Kozakai Mud Formation, Kozakai Basal Gravel Formation

• Type locality: underground of Yawata town, Toyokawa city, Aichi prefecture
• Coherent formation
• Pleistocene (MIS 5e)
• Correlation: Fukue Formation?

• Sedimentary facies: Marine, Brackish
• Sedimentary facies: Mudflat
• Lithofacies (Upper): Mud
• Lithofacies (Middle): Sands
• Lithofacies (Lower): Sands, Gravels

• Thickness: 12 m
• Thickness: ca. 3 - 7 m
• Thickness: ca. 2 - 5 m
• Thickness: ca. 5 - 8 m
• Upper limit: Unconformity (Kozakai Formation)
• Lower limit: Unconformity

• Distribution: Yawata town - Kozakai town - Toyotsu town, Toyokawa city, Aichi pref.
• Fossils: Insects, Banacles, Foraminifera, Fishes
• Fossils (Shellfishes): Cerithideopsilla djadjariensis, Clithon sowerbianus, Crassostrea gigas, Fluviocingula elegantula, Macoma incongrua, Patelloida pygmaea lampanicola, Tegillarca granosa, Trapezium liratum
• Fossils (Plants): Abies firma, Pinus parviflora
• Fossils (Pollen): Fagus sp., Pinus sp., Quercus sp., Sciadopitys sp.

• Miyazaki et al. (2008) Geology of the Goyu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 97p. (in Japanese with English abstract 3p.)