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Ajiro Formation Kanno and Arai, 1964

• Type locality: Akikawa river, Ajiro, Akiruno city, Tokyo
• Coherent formation
• Miocene

• Lithofacies: Breccia, Sandstone

• Thickness: ca, 700 m
• Upper limit: Unconformity (Yamada Formation, Onita Formation, Kasumi Formation)
• Lower limit: Unconformity (Akikawa Formation)

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

• Distribution: Akikawa river, Ajiro, Akiruno city, Tokyo

• Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)
• Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)