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Rurikei Formation Tainosho et al., 1983
Invalid synonym: Miyama Welded Tuff, Dongahata Formation
- Type locality: Hojoji - Mount Hangokuyama - Akakuma, Kameoka city, Kyoto prefecture
- Volcanic rocks
- Late Cretaceous
- Correlation: Kamogawa Formation, Tamaze Formation
- Correlation (Lower): Takedao Formation
- Intruded by: Kenbi Granite, Sugigasawa Lava, Kagobo Andesite, Diorite, Tonalite, Granodiorite, Granodiorite porphyry, Rhyolite dikes
- Lithofacies (Upper): Tuff, Tuffaceous mudstone, Sandstone, Conglomerate, Welded tuff
- Lithofacies (Middle): Rhyolite welded tuff, Lapilli tuff
- Lithofacies (Middle, Minor): Rhyolite pumice tuff, Tuffaceous sandstone, Shale
- Lithofacies (Lower): Tuffaceous sandstone, Mudstone
- Lithofacies (Lower, Minor): Rhyolite pumice tuff
- Lithofacies (Bottom): Tuffaceous conglomerate
- Sedimentary structures: Eutaxitic structure
- Thickness: ca. 1,600 m
- Thickness (Upper): ca. 300 m
- Thickness (Middle): ca. 800 m
- Thickness (Lower): ca. 500 m
- Distribution (East - West): ca. 15 km
- Distribution (South - North): ca. 9 km
- Lower limit: Unconformity (Shiroyama Complex)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Rurikei valley - Hokyo, Sonobe town, Nantan city, Kyoto pref.; Hojoji - Mount Hangokuyama - Akakuma - Nishikaya - Sengahata - Dongahata - Honme town, Kameoka city, Kyoto pref.; Kagobo - Shitsukawa, Tambasasayama city, Hyogo pref.; Tenno - Mount Shakagatake, Nose city, Toyonocounty, Osaka pref.
- Kurimoto et al. (1993) Geology of the Sasayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- Imoto et al. (1991) Geology of the Sonobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)