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Rokumantai Formation Muraoka and Hase, 1990

• Type locality: Hottate creek, Rokumantai, Kuroishi city, Aomori prefecture
• Coherent formation
• Pleistocene

• Sedimentary facies: Marine
• Lithofacies: Tuffaceous sandstone
• Sedimentary structures: Cross stratification

• Thickness (Upper): ca. 40 m
• Thickness (Lower): ca. 30 m
• Upper limit: Conformity (Hakkoda 2nd-stage Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Tazawamoriyama Formation, Aoni Tuff), Unknown (Hakkoda 1st-stage Pyroclastic Flow Deposit)

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

• Distribution: Rokumantai - Ho pass, Kuroishi city, Aomori pref.
• Fossils: Shellfishes
• Tephra: Hakkoda 2nd-stage Pyroclastic Flow Deposit

• Muraoka and Hase (1990) Geology of the Kuroishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 124p. (in Japanese with English abstract 8p.)