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Maioka Formation Association for Kanto Quaternary research, 1973

• Type locality: Kashio town, Totsuka ward, Yokohama city, Kanagawa prefecture
• Coherent formation
• Fore-arc basin sediments (Kazusa trough)
• Pleistocene
• Correlation: Soda Formation
• Contemporaneous heterotopic facies: lower Maioka Loam

• Sedimentary facies (Lower): Marine
• Lithofacies: Interbedded sands, gravels and mud
• Sedimentary structures: Cross stratification

• Thickness: ca. 25 m
• Upper limit: Conformity (Maioka Loam)
• Lower limit: Unconformity (Nishine Formation, Kamikurata Formation, Byobugaura Formation)

• Distribution: Kashio town - Maioka town, Totsuka ward, Yokohama city, Kanagawa pref.; Setogaya town, Hodogaya ward, Yokohama city, Kanagawa pref.; Tonogaya, Nagata town, Minami ward, Yokohama city, Kanagawa pref.
• Fossils (Upper): Juglans hosenjiana
• Fossils (Lower): Batillaria sp.

• Mitsunashi and Kikuchi (1982) Geology of the Yokohama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 105p. (in Japanese with English abstract 4p.)