[ Top ] [ Japanese ]

Tomiyoshi Formation Suzuki et al., 2003

Invalid synonym: Susai Formation (a local name at Susai, Yoshii town), Yoshiigawa Formation (a local name at Kumenan city)

• Type locality: Tomiyoshi, Okayama city, Okayama prefecture
• Coherent formation
• late Eocene (35.8, 34.0 Ma, FT)

• Sedimentary facies: Fluvial
• Sedimentary facies: Valley-fill deposit
• Sedimentary facies: Tributary
• Lithofacies (Upper): Conglomerate
• Lithofacies (Middle): Sandstone, Mudstone
• Lithofacies (Middle, Minor): Coal
• Lithofacies (Lower): Conglomerate

• Thickness: 100 m or thicker
• Width: 1,500 - 500 m or less
• Altitude: 80 - 330 m
• Upper limit: Unconformity (Yagane Formation, Ukan Formation, Nichiôji Formation)
• Lower limit: Unconformity (Tsudaka Formation)

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

• Distribution: Tomiyoshi - Okayama airport - Kakehata, Okayama city, Okayama pref.; Uedahigashi, Kibichuo city, Okayama pref.; Susai, Akaiwa city, Okayama pref.; Kumenan city, Kume county, Okayama pref.

• Suzuki et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.139-151 DOI