<国立科博専報>北海道日高町周辺の白亜系

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The stratigraphy of the Cretaceous sediments exposed along the Saru River and the Chiroro River, Hidaka area, is described in this paper. It is summarized in generalized section of Fig. 1. The stratigraphic sections of each reconnaissance route is shown in Figs. 2 and 3,and a geological map of the Hidaka area is presented in Fig. 5. From the evidence of fossils, listed in Tables 1 and 2,the subdivided stratigraphic units are correlated with the reference scales at home and abroad. The writers have recognized the zones of Inoceramus uwajimensis, I. amakusensis, I. orientalis and I. schmidti in the Upper Yezo Group, so that the group in the studied area can be safely referred to Lower Urakawan, Coniacian in terms of the international scale, up to Lower Hetonaian, i. e., Upper Campanian. The zones of Desmoceras japonicum and Inoceramus hobetsensis have been recognized in the Middle Yezo Group. Thus, the group in this area corresponds approximately to Lower to Upper Gyliakian, i. e., from Upper Cenomanian to Turonian. Douvilleiceras mammillatum, a zoning index of Lower Albian, has been discovered in the Lower Yezo Group. Brief geologic remarks are given on some formations in connection with the correlation. For example the Hetonaian deposits exposed in the Hidaka and Urakawa areas, both located close to the Hidaka Mountains and representing the eastern part of the Cretaceous sedimentary basin, are much thicker and less coarse than typical Hakobuchi formation in the west. This fact supports the conclusion reached by T. MATSUMOTO et al. (1962,1971).
国立科学博物館の論文
1973-12-20

<国立科博専報>北海道日高町周辺の白亜系

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