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Minato Formation

• Coherent formation
• Oligocene

• Sedimentary facies: Swamp or River mouth - Lagoon
• Lithofacies (Upper): Siltstone, Mudstone, Sandstone, Conglomerate
• Lithofacies (Upper, Minor): Tuff, Coal
• Lithofacies (Lower): Conglomerate
• Lithofacies (Lower, Minor): Sandstone, Siltstone, Tuff
• Sedimentary structures (Lower): Planar cross-stratification, Imbricate structure

• Thickness: 180 m
• Thickness (Upper): 100 m
• Thickness (Lower): 80 - 120 m
• Upper limit: Conformity (Kuki Formation)
• Lower limit: Parallel unconformity (Sawayama Formation)

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

• Distribution: Terasato, Kuji city, Iwate pref.
• Fossils: Fish scales, Corbicula? sp.
• Fossils (Upper, Plants): Acer arcticum, Adiantites sp., Betula sp., Cercidiphyllum arcticum, Cercidiphyllum elongatum?, Cornus hyperborea?, Crataegus antiqua, Equisetum sp., Geonomites? sp., Glyptostrobus europaeus, Juglans sp., Metasequoia occidentalis, Musophyllum cfr. complicatum, Osmunda macrophylla, Platanus guillelmae?, Populus zaddachi, Salix sp., Sequoia langsdorfi, Sphenopteris sp., Taxedium dubium, Torreya? dicksoniana, Ulmus? sp., Viburunum nordenskiödi
• Fossils (Lower): Plants

• Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)
• Shimazu and Teraoka (1962) Rikuchu-Noda, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 53p. (in Japanese with English abstract 11p.)