About OKA TAKAO
About 北海道立地質研究所報告
About geological structure
About lowland
About Quaternary Period
About tectonics
About Pleistocene Epoch
About stratigraphy(sequence of layers)
About facies(sedimentology)
About borehole
About well(oil and gas)
About soil profile
About depth
About stratigraphic correlation
About elevation control point
About Holocene series
About borehole
About geologic section
About depth
About Civil engineering geology and hydrogeology in general
About Geological structure and tectonics
About Geophysical and geological exploration in general
About Quaternary
About 石狩低地帯
About 低地
About 地下地質
About 第四紀
About テクトニクス
About 更新
About 完新統
About 層序
About 層相