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Motojuku Formation Okazaki Chishitsu Chosa Kenkyukai, 1973

• Type locality: Sobumi Kannon, Kamisobumi town, Okazaki city, Aichi prefecture
• Coherent formation
• middle Miocene
• Correlation: Tsukude Formation

• Sedimentary facies: Fluvial
• Sedimentary facies: Valley-fill deposits (2 valleys)
• Lithofacies: Conglomerate
• Lithofacies (Minor): Sandstone
• Paleocurrent: from North to South

• Source: in the vicinity of Natsuyama, Minamiosu town and Shimosobumi
• Thickness: 40 - 90 m
• Lower limit: Unconformity (Ryoke Metamorphic Rocks, Busetsu Granite)

• Distribution: Minamiosu town - Natsuyama town - Obata town - Kamisobumi town - Motojuku town - Kashiyama town - Yomogyu town - Sakuraiji town - Shimosobumi town, Okazaki city, Aichi pref.

• 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.)