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Yakuno Group
Invalid synonym: Kawanishi Group, Kawahigashi Group
- Type locality: Nukata, Yakuno town, Fukuchiyama city, Kyoto prefecture
- Coherent formation
- early - middle Triassic
- Correlation: Fukumoto Group, Miharaiyama Group
- Sedimentary facies: Marine
- Sedimentary facies: Delta, Continental shelf
- Lithofacies: Mudstone, Sandstone, Conglomerate
- Sedimentary structures: Upward-fining
- Distribution (Width): ca. 2.5 km
- Lower limit: Unconformity (Maizuru Group)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nukata, Yakuno town, Fukuchiyama city, Kyoto pref.; Narahara - Gujo, Oe town, Fukuchiyama city, Kyoto pref.; Ichio - Oro - Hinoo - Joganji - Nagasu - Ominagaso, Fukuchiyama city, Kyoto pref.; Hirobatake - Okuyama, Ayabe city, Kyoto pref.; Hyogo pref.
- Fossils: Ammonoids (Danubites sp., Ceratite-type), Nautiloids, Belemnite, Bivalves (Claraia sp.), Gastropods (Sisenna japonica), Brachiopods (Spiriferina sp.), Bryozoans, Plants
- Suda and Hayasaka (2009) Jour. Geol. Soc. Japan, vol.115, no.6, pp.266-287 DOI
- Takemura et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.123-137 DOI
- Kobayashi (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.80-87 DOI
- Kurimoto and Makimoto (1990) Geology of the Fukuchiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 97p. (in Japanese with English abstract 5p.)
- Igi and Kuroda (1965) Oeyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 81p. (in Japanese with English abstract 12p.)
- Hirokawa (1954) Tajima-Takeda, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 20p. (in Japanese with English abstract 9p.)