Abstract
Synopsis 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 Lomond Stadial. The sediments are thought to have been ice-rafted from the shore nearby, and part of the mud fraction removed by tidal currents and wave action, either at the time of deposition or at a later date. It is suggested that the rafting process is an intensification of that present throughout the earlier Windermere Interstadial, and may account for near-shore supposedly glaciomarine gravel-, cobble- and boulder-rich deposits of Lateglacial age elsewhere.
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