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Kengakura Formation

• Coherent formation
• Late Triassic, Norian

• Sedimentary facies: Marine
• Depth of water: Deeper
• Lithofacies (Upper): Interbedded sandstone and shale
• Lithofacies (Middle): Shale
• Lithofacies (Lower): Conglomerate, Sandstone, Limestone
• Sedimentary structures (Upper): Cross stratification

• Thickness: 300 - 600 m
• Thickness (Middle): ca. 100 - 150 m
• Thickness (Lower): ca. 1 m

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

• Distribution: Kengakura creek - Mount Takigakura - Mount Kengakura - Mizunaga creek - Uraechigo creek - Echigo creek, Minakami city, Tone county, Gunma pref.
• Fossils: Shellfishes

• Chihara and Komatsu (1992) Geology of the Hakkaisan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 107p. (in Japanese with English abstract 8p.)