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Takakubo Formation

Invalid synonym: Takakubo Mudstone Member

Some rearchers treat as a member of Otogawa Formation.

• Type locality: Ishikawa prefecture
• Coherent formation
• late Miocene - Pliocene (5.5 - 3.5 Ma, Diatoms)

• Lithofacies (Upper): Siltstone
• Lithofacies (Upper, Minor): Tuffaceous sandstone
• Lithofacies (Lower): Sandy mudstone, Siltstone, Silty mudstone

• Thickness: ca. 10 - 200 m
• Thickness (Upper): ca. 100 m
• Thickness (Lower): ca. 50 m
• Upper limit: Conformity (Omma Sandstone Member)
• Lower limit: Transitional (Kurahara Sandstone Member), Conformity (Shimoaraya Tuff Member)

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

• Distribution: Kanazawa city, Ishikawa pref.; Hachibuse, Oyabe city, Toyama pref.; Fukumitsu, Nanto city, Toyama pref.
• Fossils: Teredo sp.
• Fossils (Shellfishes): Neptunea sp., Yoldia sp.

• Tamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.1-20 DOI
• Sumi (1978) Geology of the Tsubata District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 4p.)
• Inoue et al. (1964) Johana, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 5p.)
• Imai (1959) Kanazawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 3p.)