Quaternary Sediments and Vertical Movements in Ishikari Plain, Hokkaidô, Japan
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概要
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This study is based on the data of some wells for exploration of oil and gas and the data of many shot holes for seismic survey. As a result of it, the Quaternary sediments developed in this area have been stratigraphically subdivided as follows:thicknessA4: Bottom deposits of the present sea ?A3: Sand and gravel 10m±A2: Clay, peat and pumice 30m±A1: Gravel, sand, clay and peat 30m±S:Shikotsu volcanics(20, 000years B. P.)Shishinai Formation 50m±Nopporo Formation 50m±Characteristic change in distribution and arrangement of the Quaternary sediments in this area is thought to be due to three types of vertical movements, which differ distinctly with each other.
- 日本第四紀学会の論文