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Matsukuma Formation Matsumoto and Kanmera, 1964

• Type locality: Kuma river - Mameguri valley, Shimanto town, Yatsushiro city, Kumamoto prefecture
• Accretionary complex
• Deposition: Late Triassic, Carnian (Bivalves)

• Sedimentary facies: Marine
• Sedimentary facies: Continental shelf
• Lithofacies: Mudstone
• Lithofacies (Minor): Sandstone
• Sedimentary structures: Parallel stratification, Low angle cross-stratification

• Thickness: ca. 75 m or thicker
• Upper limit: Unconformity (Sakamoto Formation), Parallel unconformity (Hirasawatsudani Formation)
• Lower limit: Fault, Unknown (Kozaki Formation)

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

• Distribution: Kuma river - Mameguri valley - Iiboshi river - Hirasawatsudani, Shimanto town, Yatsushiro city, Kumamoto pref.
• Fossils (Bivalves): Halobia kawadai, Halobia molukkana, Otapiria dubia, Pseudolimea? naumanni, Cardinia misawensis, Palaeoneilo fujinohira

• Ishida (2015) Jour. Geol. Soc. Japan, vol.121, no.2, pp.45-58 DOI
• Ishida (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.83-94 DOI