ICE-RAFTED SEDIMENTS OF LOCH-LOMOND STADIAL AGE IN WESTERN SCOTLAND

At two former oil platform sites (Portavadie and Ardyne) in the Clyde estuary, several metres of very poorly sorted gravelly and cobbly silt and sand of the Portavadie Formation were deposited during the Loch L omond Stadial. The sediments are thought to have been ice-rafted from the shore nearby, and part of the mud fraction removed by tidal curren ts and wave action, either at the time of deposition or at a later dat e. It is suggested that the rafting process is an intensification of t hat present throughout the earlier Windermere Interstadial, and may ac count for near-shore supposedly glaciomarine gravel-, cobble- and boul der-rich deposits of Lateglacial age elsewhere.