Multiphase water-escape features developed in glacial sediments exposed at Clava, Inverness

This report describes the micromorphology of samples prepared from Quaternary glaciogenic sediments exposed in the Clava area, near Inverness, Scotland. The work forms part of the Engineering Geology of Tills Project of the Physical Hazards Programme. The first part of the report provides the background information on the Quaternary geology of the Clava area. This is followed by a section describing the detailed micromorphology of six large format thin sections of the matrix of a locally shelly, clay-rich silty diamicton and the structurally overlying sands, silts and clay layers. The results are used to develop a model for the role of pressurised pore water and water-escape during the glacitectonic emplacement of rafts of shell-bearing marine deposits within the Pleistocene glaciogenic sequence exposed at Clava.