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Kisawahata Formation

• Type locality: Kisawahata, Yamagata town, Kuji city, Iwate prefecture
• Accretionary complex
• Deposition (Limestone): Middle Triassic, Ladinian or Late Triassic, Carnian (Conodont)

• Sedimentary facies: Marine
• Lithofacies: Coherent facies (Chert-clastic sequence)
• Lithofacies (Upper): Chert
• Lithofacies (Upper, Minor): Siliceous mudstone
• Lithofacies (Lower): Interbedded sandstone and mudstone, Mudstone, Chert, Siliceous mudstone, Tuff
• Lithofacies (Minor): Limestone

• Thickness: 1,000 m or thicker

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

• Distribution: Kayamori - Kisawahata, Yamagata town, Kuji city, Iwate pref.
• Fossils (Limestone, Conodonts): Paragondolella polygnathiformis
• Deposit: Bedded manganese deposit

• Ehiro et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.121-139 DOI
• 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.)