[ Top ] [ Japanese ]

Motoaikai Formation Hanzawa, 1958

Invalid synonym: Dokuzawa Formation

• Type locality: Motoaikai, Shinjo city, Yamagata prefecture
• Coherent formation
• Pliocene (3.0 - ? Ma, FT)
• Correlation: Jozenji Formation, upper Oriwatari Formation

• Sedimentary facies (Upper): Marine
• Sedimentary facies (Lower): Fluvial
• Sedimentary facies (Upper): Fore shore, Inner shelf
• Lithofacies (Upper): Sandstone
• Lithofacies (Lower): Interbedded sandstone and mudstone
• Lithofacies (Lower, Minor): Lignite

• Thickness: 300 m or thicker
• Lower limit: Unconformity (Yamuke Formation)

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

• Distribution: Motoaikai, Shinjo city, Yamagata pref.
• Fossils: Shellfishes, Diatoms
• Tephra: K4 (Pyroclastic flow deposit), KW

• Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.8, pp.389-404 DOI
• Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.1-15 DOI