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Arakura Formation

• Coherent formation
• Late Triassic, Carnian

• Sedimentary facies: Marine
• Lithofacies: Shale
• Lithofacies (Minor): Sandstone
• Sedimentary structures: Parallel stratification

• Thickness: ca. 60 - 200 m
• Upper limit: Unconformity (N₂ FOrmation)

• Distribution: Arakura - Shikahara - Kissakatoge pass, Maizuru city, Kyoto pref.
• Fossils: Ammonoids (Monophyllites arakurensis), Brachiopods (Spiriferina sp.), Bryozoans
• Fossils (Shellfishes): Halobia? sp., Lima sp., Nuculopsis sp., Palaeoneilo sp., Psioidea spp.

• Igi et al. (1961) Maizuru, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 9p.)