[ Top ] [ Japanese ]

Shiroiwagawa Formation Maeda, 1956

Invalid synonym: Shiroiwagawa Alternation of Tuff, Shale and Sandstone, Shitakadani Alternation of Tuff, Shale and Sandstone, Nagaoyama Formation, Nagaoyama Conglomerate and Sandstone

• Type locality: Shiroiwa river, east of Mount Tonokura, Toyama prefecture
• Coherent formation
• Cretaceous
• Correlation (Nagaoyama Conglomerate and Sandstone): Yakushizawamigimata Conglomerate Member

• Sedimentary facies: Terrestrial
• Sedimentary facies (Upper): Flood plain
• Sedimentary facies (Lower): Gravelly fluvial
• Lithofacies (Upper): Mudstone, Sandstone, Interbedded sandstone and mudstone
• Lithofacies (Middle): Sandstone, Interbedded sandstone and mudstone, Mudstone
• Lithofacies (Lower): Sandstone, Interbedded sandstone and mudstone
• Lithofacies (Lower, Minor): Conglomerate, Mudstone
• Sedimentary structures: Graded bedding

• Thickness: 650 m or thicker
• Upper limit: Unknown
• Lower limit: Conformity

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

• Distribution: Sengoku river - Nagakura mountain pass, Tateyama city, Toyama pref.; Kamiichigawa 2 dam, Toyama pref.; Mount Raihai, Toyama pref.
• Fossils: Plants (Leaves, Trunks), Dinosaurs (Footprints)

• Matsukawa et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.6, pp.201-217 DOI
• Matsukawa et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.5, pp.147-164 DOI