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Sakamoto Formation

Invalid synonym: Sakamoto Group

• Type locality: Sakamoto town, Yatsushiro city, Kumamoto prefecture
• Accretionary complex
• Deposition: Early Jurassic, Pliensbachian
• Correlation: Hirasawatsudani Formation

• Sedimentary facies: Marine
• Sedimentary facies: Continental shelf
• Lithofacies (Lower): Mudstone
• Lithofacies (Lower bottom): Interbedded sandstone and mudstone
• Lithofacies (Bottom): Sandstone
• Lithofacies (Bottom, Minor): Conglomerate

• Thickness (Lower): 50 - 100 m
• Thickness (Bottom): 20 - 100 m
• Upper limit: Unknown
• Lower limit: Unconformity (Matsukuma Formation, Takagochi Formation, Takagochi Formation, Tanoura Formation)

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

• Distribution: Shiburi Belt, Western Kyushu; Sakamoto, Yatsushiro city, Kumamoto pref.
• Fossils: Radiolarians, Ammonoids (Perisphinctes sp., Aulacosphinctes sp.)

• 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