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The Tertiary Ideyama Formation of the Otsuji Group, named and defined by NAGAO (1925), occupies a considerable portion of the Chikuho Coal-field. This formation is found between two coal measures, the... underlying Uwaishi and the ovelying Onga Formation. It is distributed in the region extending over the Nogata and Tagawa districts and in the southeast areas of the Iizuka district. The Ideyama Formation is mainly composed of non-marine coarse-grained sediments with small amounts of fine deposits and coaly matter, and lies unconformably on the Uwaishi Formation of the Nogata Group. From the cycle of sedimentation, this formation is divided into several members, which are traceable and mappable in every district. The relationships of their members among three districts are shown as the Table 3 based on the stratigraphical and sedimentological correlation. The sedimentary basin of the Ideyama Formation is characterized by having the rapid local streams and by the rhythmical and cyclical subsidence. Subsequently to the northward expansion of the basin at the last stage of deposition of the Nogata Group, subsidence of the basin proceeded followed by an eastward tilting to result eastward leaning center of deposition at the initial stage of the Ideyama Formation. The basin was differentiated into two basins by the movement at the middle of the same depositional age. It was perfectly cut off from a channel connecting with the southern sea area in the later half of the same age, and subsidence of the basin was propagated to result northward expansion of the sedimentary area. The series of these movements is referred to the transitional period from the regression of the Paleo-Ariake Bay to the transgression of the Paleo-Genkai embayment. Then the Ideyama Formation is a product formed during a mobile phase in the basin, the Chikushi tilting phase proposed by MATSUSHITA (1967), which is corresponding to the presecessor of the Takachiho disturbance in south Kyushu.続きを見る
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Introduction Acknowledgements ChapterⅠ.General geology in and around the Chikuho Coal-field ChapterⅡ.Lower and upper limits of the Ideyama Formation ChapterⅢ.Descriptive notes on the Ideyama Formation ChapterⅣ.Geological structure and its bearing ChapterⅤ.Sedimentary basin of the Ideyama Formation Conclusion References
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21_02_p239