Physical properties of till deposits from Anglesey, north west Wales

This report describes a study of geotechnical properties of till deposits that occur on Anglesey as part of the BGS Geotechnical and Geophysical Properties and Processes Team under Land Use and Development Programme. The first part of the report describes the sampling methods and the later the results. In the final section the engineering significance of the findings is discussed. The appendix includes the results of a trial to use rapid geochemical mapping techniques (handheld XRFS) to map the geochemical properties, and spatial extent of till units. The till deposits on Anglesey are a mix of fine and coarse grained soils and this textural variability affects their geotechnical and hydrogeological properties. In engineering terms the tills on Anglesey are typically very stiff/hard, with very high stiffness and low permeability.