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Shodai Formation (Mitamura, 1992) Miyachi, 2001

• Type locality: Harimadani valley, Nagao, Hirakata city, Osaka prefecture
• Coherent formation
• Pliocene - Pleistocene

• Sedimentary facies: Fluvial, Lacustrine
• Lithofacies: Gravels, Sands, Silt

• Thickness: ca. 60 m or thicker
• Lower limit: Bottom of the horizon of gravel-dominant bed including Hacchoike Tephra.
• Lower limit: Transitional (Seika Formation)

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

• Distribution: Harimadani valley - Arasaka - Lake Yamadaike - Fujisaka, Nagao, Hirakata city, Osaka pref.
• Tephra: Hacchoike, Kasuri
• Key bed (Marine clay): Ma 5, Ma 6, Ma 7, Ma 8

• Miyachi et al. (2005) Geology of the Kyoto-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 4p.)
• Miyachi et al. (2001) Geology of the Osaka-Tohokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 130p. (in Japanese with English abstract 6p.)