ABSTRACTTill ridges at Eyjabakkajökull, Iceland, are considered to be 'crevasse-fill’ridges formed by the flow of sediments from the dilatant horizon of subglacial lodgement tills into open crevasses in response to local variations in overburden pressure. Crevasses are formed during the active phase of a surge cycle, and are filled with sediment during the early part of the quiescent phase as the stagnant glacier sinks into its bed. The resultant ridges form a network covering the whole of the area in which crevassing penetrated to the bottom of the glacier during the surge. Nowhere are they associated with till ridges formed at and parallel to the glacier margin. Since similar ridges have been observed at a number of other surging glaciers, it is suggested that lodgement till surfaces crossed by networks of‘crevasse-fill’ridges may be characteristic of surging glaciers.