Environmental and engineering applications of the surficial geology of the Fraser Lowland, British Columbia

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Authors:Armstrong, John E.
Source:Paper - Geological Survey of Canada, Vol.83-23, 54p. Publisher: Geological Survey of Canada, Ottawa, ON, Canada. ISSN: 0068-7650
Publication Date:1984
Note:In English with French summary. 130 refs.
Summary:Bedrock is at or within 10 m of the surface in less than 5% of the Fraser Lowland, consequently the geology of most concern is that of the remaining area where unconsolidated (Quaternary) sediments between 10 and 300 m thick overlie bedrock. During the Quaternary the lowland was subjected to repeated glaciations separated by nonglacial intervals. Each major glaciation in the lowland went through three main stages. Some geological materials form very poor bases for foundations because of low-bearing capacity and/or poor drainage; others are good because of their excellent bearing capacities and/or good drainage. The most troublesome materials in the Fraser Lowland on which to support foundations are "sensitive" marine and glaciomarine silty clays, organic sediments, and loosely compacted sand and silt. The two commonest natural hazards in the Lowland are floods and landslides. Construction materials are plentiful but much of them may be lost as a result of rapid urban growth and zoning regulations. In all agricultured soil mapping the geological materials from which the "soil" develops is a major controlling factor as to the class of topsoil. Ground-water supplies, which are plentiful in much of the Fraser Lowland, vary according to the precipitation and the drainage of the geological materials.
Subjects:Cenozoic; Clastic sediments; Construction materials; Engineering geology; Environmental geology; Floods; Foundations; Geologic hazards; Glacial sedimentation; Glaciomarine sedimentation; Ground water; Land use; Landslides; Marine sedimentation; Mass movements; Planning; Quaternary; Sedimentation; Sediments; Seismicity; Sewage; Soils; Surficial geology; Till; Waste disposal; British Columbia; Canada; Western Canada; Fraser Lowland; Point Grey
Record ID:1984049210
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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