[ Top ] [ Japanese ]

Narai Formation Katada and Isomi, 1962

• Type locality: Narai, Shiojiri city, Nagano prefecture
• Accretionary complex
• Jurassic

• Sedimentary facies: Marine
• Lithofacies: Mélange facies
• Matrix: Mudstone
• Exotic blocks (Crusts): Sandstone
• Sedimentary structures: Parallel stratification

• Thickness: 1,000 - 2,500 m
• Upper limit: Bottom of the horizon including thick chert beds
• Upper limit: Conformity (Yokokawa Formation)

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

• Distribution: Narai - Mount Kiritoyama, Shiojiri city, Nagano pref.; Oshino, Tatsuno city, Kamiina county, Nagano pref.
• Fossils (Trace fossils): Helminthoidea isp.

• Yamakita and Otoh (2000) Structural Geology, vol.44, pp.5-32
• 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.)