Esker
(from the Gaelic) A long, commonly sinuous ridge of sand and gravel, deposited by a stream in a subglacial tunnel.
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Esker (arrowed) exposed by the receding margin of the glacier Comfortlessbreen (background) in NW Spitsbergen, Svalbard. The ridge is about 3 m high. Photo M. J. Hambrey, 1992. |