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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, Tamase Welded Tuff
• Correlation (Lower): Bosangawa Formation
• Intruded by: Kenbi Granite, Sugigasawa Lava, Kagobo Andesite, Diorite, Tonalite, Granodiorite, Granodiorite porphyry

• 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

• Thickness: ca. 1,600 m
• Thickness (Upper): ca. 300 m
• Thickness (Middle): ca. 800 m
• Thickness (Lower): ca. 500 m

------ 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, Kameoka city, Kyoto pref.; Kagobo - Shitsukawa, Tambasasayama city, Hyogo pref.; Tenno, 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.)