Abstract
This paper deals with the nature of the boundary between the Omma formation and the Utatsuyama formation and the correlation of the Plio-Pleistocene formations developing around Kanazawa City and Osaka district.As the results of the stratigraphical research concerning the interface between the Omma and the Utatsuyama formation, it seems that the Utatsuyama formation overlies on the Omma formation with conformable relation. However, considering each geological age of both formations by means of the biostratigraphy and paleo-magnetic stratigraphy, it seems to be considered that the stratigraphical relation of the formations is unconformity and that the Utatsuyama formation is correlated with the upper part of the Osaka group and the Omma formation do with the unconformity blank between the Osaka and the Nijio group.
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