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Hontaniyama Formation
- Coherent formation
- Late Triassic, Norian
- Sedimentary facies: Marine
- Depth of water: Shallower
- Lithofacies: Sandstone, Shale
- Lithofacies (Basal): Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Idosawa creek, Mount Hontani - Mount Echigosawa - Mizunaga 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.)