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Koromo Formation Machida et al., 1962

Invalid synonym: Umetsubo Formation, Hosokawa Formation, Nikki Formation

Synonym?: Aburagafuchi Formation

• Type locality: Shidare town - Toyota town, Toyota city, Aichi prefecture
• Coherent formation
• middle Pleistocene

• Sedimentary facies: Fluvial, Marine?
• Lithofacies: Sand-dominant interbedded sands, mud and gravels
• Sedimentary structures: Cross stratification

• Thickness: ca. 10 - 70 m
• Thickness (Northeast): ca. 30 m
• Thickness (Central): ca. 35 m
• Thickness (Southwest): ca. 70 m
• Upper limit: Unconformity (Hekikai Formation)
• Lower limit: Unconformity (Fujioka Formation, Yadagawa Formation, Younger Ryoke Granitoids)

• Distribution: Shidare town - Toyota town, Toyota city, Aichi pref.; Anjo city, Aichi pref.
• Fossils (Pollen): Cryptomeria sp.

• Nakashima et al. (2021) Geology of the Toyota District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 91p. (in Japanese with English abstract 4p.)
• Makinouchi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.2, pp.79-94 DOI