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The stratigraphic boundary between the Cretaceous and Tertiary formations in Amakusa and its adjacent areas is restudied through both field and laboratory works. The paleontological and lithostratigra...phical studies have revealed that the unconformity separating the two systems represents a time-interval of variable extent from place to place. The studies of geological structures and petrography of sandstone indicate that a remarkable crustal movement accompanied with clear changes in source rocks and environments occurred in the age represented by the unconformity and that the Paleogene sediments were accumulated in the tectonic depressions formed by the movement. Another movement took place in mid-Tertiary in these areas. Based on the available data, the Paleogene paleogeography and the paleo-environment of the studied areas and the tectonic development of the sedimentary basins are discussed in comparison with other related areas.続きを見る
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Ⅰ.Introduction Ⅱ.Stratigraphy of the Upper Cretaceous and Paleogene formations Ⅲ.Relationship between the Upper Cretaceous and Palaeogene formations Ⅳ.Geological history during Upper Cretaceous and Paleogene and other areas in Kyushu Ⅴ.A comparison of the tectonic history between Amakusa in Amakusa and its adjacent areas Ⅵ.Concluding Remarks Acknowledgements References Cited
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Mendeley出力
23_02_p165