[ Top ] [ Japanese ]

Yoshiki Formation Igo et al., 1980

• Type locality: Osobudani valley, Fukuji, Okuhidaonsengo, Takayama city, Gifu prefecture
• Coherent formation
• Silurian - Devonian

• Sedimentary facies: Marine
• Lithofacies (Top): Mudstone
• Lithofacies (Upper): Pumiceous tuff
• Lithofacies (Middle): Interbedded mudstone and sandstone
• Lithofacies (Lower): Pumice-bearing tuff
• Lithofacies (Bottom): Interbedded siliceous mudstone and sandstone
• Sedimentary structures (Top): Slump structures

• Thickness: 50 m or thicker
• Thickness (Top): ca. 9 m
• Thickness (Upper): ca. 9 m
• Thickness (Middle): ca. 11 m
• Thickness (Lower): ca. 10 m
• Thickness (Bottom): ca. 12 m

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

• Distribution: Osobudni valley - Kanashirozako, Fukuji, Okuhidaonsengo, Takayama city, Gifu pref.
• Fossils: Radiolarians, Scolecodonts

• Tazawa et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.127-133 DOI
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)