The Triassic Tandodani Formation in the Hongo area, Hida Gaien belt, central Japan

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The Triassic Tandodani Formation in the Hongo area, Hida Gaien belt, central Japan is newly defined and described. The formation is divided into the Lower and Upper Members. The former is composed mainly of tuffaceous clastic rocks with minor amount of felsic tuff intercalations, while the latter is mainly felsic tuff, and alternating beds of felsic tuff and tuffaceous mudstone. The Upper Member yields late Triassic conodonts (Tsukada et al., 1997) and, at its upper limit, in in fault contact with the Carboniferous Arakigawa Formation.

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