[ Top ] [ Japanese ]

Yokokawa Formation Katada and Isomi, 1962

• Type locality: Yokokawa river, Tatsuno city, Kamiina county, Nagano prefecture
• Accretionary complex
• Jurassic

• Sedimentary facies: Marine
• Lithofacies: Mélange facies
• Matrix: Mudstone
• Exotic blocks (Crusts): Chert, Sandstone
• Exotic blocks (Crusts, Minor): Limestone

• Upper limit: Conformity (Kuwazawa Formation)
• Lower limit: Bottom of the horizon including thick chert beds
• Lower limit: Conformity (Narai Formation)

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

• Distribution: Yokokawa river - Ono, Tatsuno city, Kamiina county, Nagano pref.
• Fossils: Plant fragments
• Fossils (Trace fossils): Helminthoidea isp.

• Katada and Isomi (1964) Shiojiri, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 52p. (in Japanese with English abstract 10p.)
• Katada and Isomi (1962) Ina, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 28p. (in Japanese with English abstract 7p.)