[ Top ] [ Japanese ]

Tsuchiyutoge Formation Kitamura et al., 1965

• Type locality: Tsuchiyu pass - Makukawa hot spring, Tsuchiyuonsen town, Fukushima city, Fukushima prefecture
• Coherent formation
• middle Miocene
• Contemporaneous heterotopic facies: Upper Numazawa Formation, Ninosawa Formation
• Correlation: Horiguchi Formation
• Correlation (Marginal facies): Iwakura Formation
• Intruded by: Andesite, Basalt

• Sedimentary facies: Marine
• Lithofacies: Mudstone
• Lithofacies (Minor): Sandstone, Rhyolitic pumiceous volcanic sandstone, Tuff
• Sedimentary structures: Parallel stratification

• Thickness: ca. 600 m
• Upper limit: Unconformity (Kijigoya Formation, Yokomuki Formation)
• Lower limit: Unconformity (Cretaceous plutonic rocks)

• Distribution: Tsuchiyu pass - Makukawa hot spring, Tsuchiyuonsen town, Fukushima city, Fukushima pref.
• Fossils: Calcareous nannofossils

• Furukawa et al. (2018) Geology of the Azuma Yama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 74p. (in Japanese with English abstract 3p.)
• Hasegawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.33-48 DOI