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Taishu Group

• Type locality: Tsushima city, Nagasaki prefecture
• Coherent formation
• Eocene - middle Miocene
• Upper Formation: middle Miocene (17.6 - 16.6 Ma, Foraminifera)
• Middle Formation: middle Eocene (46.5, 43.9 Ma, FT)
• Lower Formation: early Eocene (56 - 50 Ma, Radiolarians)

• Sedimentary facies: Marine
• Sedimentary facies (North): Slope, Submarine fan
• Sedimentary facies (South): Delta
• Depth of water (North): Bathyal
• Depth of water (South): Shallow
• Lithofacies: Sandstone, Interbedded sandstone and mudstone, Mudstone
• Lithofacies (Upper): Interbedded sandstone and mudstone
• Lithofacies (Upper, Minor): Sandstone
• Lithofacies (Middle): Mudstone
• Lithofacies (Lower): Interbedded sandstone and mudstone
• Sedimentary structures: Slump structures, Current ripples, Climbing ripples, Parallel stratification, Convolute lamination, Load cast, Flute marks, Groove marks
• Sedimentary structures (Minor): Trough cross-stratification, Flaser bedding, Longitudinal furrows and ridges, Flame structures, Dish structures, Graded bedding
• Paleocurrent: North-northeast to Northeast

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

• Distribution: Tsushima city, Nagasaki pref.

• Ninomiya et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.174-177 DOI
• Oho et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.4, pp.146-157 DOI
• Yamaguchi and Oho (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.113-126 DOI