The Cenozoic strata in the northern area of Mizunami-machi, Toki-gun, Gifu Prefecture have been well known to Japanese geologists and palaeontologists because of a rich fossil content., As a result of recent studies, the writers have established seven formations as fundamental units in the lithologic classification of the strata., These units are: the Tokimachi tuffaceous mudstone, the Shukunohora sandstone, the Hongo tuffaceous sandstone, the Konokure formation (tuffaceous sandstone alternating with breccia), the Tsukiyoshi tuffaceous sandstone, the Togari tuffaceous mudstone, and the Toki formation (sand and gravel)., Of these formations, all except the Toki may be combined as the Mizunami group., In this paper, each unit is defined and described and the stratigraphic relations are briefly summarized.,
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