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Ishimoriyama Tuff Breccia Member

• Type locality: Mount Ishimori, Iwaki city, Fukushima prefecture
• Coherent formation
• southern Yezo Forearc basin (Jobanoki basin)
• early Miocene

• Sedimentary facies: Marine
• Sedimentary facies: Upper continental slope
• Lithofacies: Andesitic tuff breccia, Pillow lava, Hyaloclastite
• Lithofacies (Minor): Sandstone, Mudstone
• Sedimentary structures: Cross stratification

• Thickness: ca. 40 - 80 m

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

• Distribution: Mount Ishimori, Iwaki city, Fukushima pref.; Kanzawa, Samegawa city, Higashishirakawa county, Fukushima pref.; Kamitono, Tono town, Iwaki city, Fukushima pref.

• Ando et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.49-67 DOI
• Kano et al. (1973) Geology of the Takanuki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 109p. (in Japanese with English abstract 6p.)
• Iwao and Matsui (1961) Taira and Kawamae, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 17p.)