[ Top ] [ Japanese ]

Shintachi Formation Tanaka, 1965

• Type locality: Kinyuji river, Shindachi, Sennan city, Osaka prefecture
• Coherent formation
• Izumi sedimentary basin
• Forearc basin associated with strike-slip fault related to Median Tectonic Line
• Late Cretaceous, Maastrichtian (72.1 Ma, FT)
• Intruded by: Nabeyama Andesite

• Sedimentary facies: Main filling of the sedimentary basin
• Lithofacies: Turbidite
• Lithofacies (Upper): Interbedded sandstone and mudstone
• Lithofacies (Lower): Interbedded conglomerate, sandstone and mudstone
• Sedimentary structures (Upper): Graded bedding, Sole marks
• Sedimentary structures (Lower): Parallel stratification, Sole marks, Graded bedding, Slump structure, Channel structure
• Paleocurrent: from Northwest to Southeast, from Northeast to Southwest

• Thickness: ca. 1,700 - 6,900 m

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

• Distribution: Kinyuji river, Shindachi, Sennan city, Osaka pref.; Kuwahata, Hannan city, Osaka pref.; Mount Unzanpo, Wakayama city, Wakayama pref.
• Fossils: Inoceramus sp., Ostrea, Portlandia izumiense, Echinoids, Plants
• Tephra: t10, t12 (72.1 Ma, FT)

• Miyata et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.37-52 DOI
• Makimoto et al. (2004) Geology of the Kokawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 89p. (in Japanese with English abstract 4p.)
• Miyata et al. (1993) Geology of the Wakayama and Ozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 4p.)
• Itihara et al. (1986) Geology of the Kishiwada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)