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Basal Formation Matsumoto, 1939

• Coherent formation
• Late Cretaceous

• Lithofacies (Upper): Mudstone, Sandstone
• Lithofacies (Lower): Basal conglomerate

• Thickness: 15 - 300 m
• Lower limit: Unconformity (Mizukoshi Formation, Manotani Metamorphic Rocks, Kiyama Metamorphic Rocks)

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

• Distribution: Kumamoto city, Kumamoto pref.

• Ikegami et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.127-130 DOI