9th October 2006,   Monday CORSTORPHINE HILL, EDINBURGH Tour:   Geo             Participants:  4 Weather:   Dry, sunny and very mild.   Key Points:    A medium-grained dolerite sill, intruding sandstones and cementstones of Carboniferous age. Tilted to the west by earth movements. Quaternary ice sheets stripped off the top cover of sediments and rode easily, from west to east, over the gentle westerly-dipping dolerite dip slope, moulding the top surface into glaciated pavements.  To the east, steeper slopes hide the sedimentary formations below. The direction of ice movement on Corstorphine Hill may be inferred as either west to east or east to west by the presence of scratch marks on some of the glaciated pavement surfaces and by the carving of weaker layers in the dolerite in the direction of ice movement.   However, the presence of roches moutonnées proves that movement was, in fact, from west to east.  In these, the smoothed, streamlined surface indicates the up-glacier surface, while the broken, plucked out side is the lee-side. A roche moutonnée.  The direction of ice movement was from west to east, upslope, on the gentle western slope of the hill, i.e from the right in the photograph (smoothed surface), towards the bottom left in the photograph (plucked out).