Definitions for "Esker"
a snake-like ridge of roughly stratified sand and gravel formed by water flowing in or under a glacier.
A long winding ridge of sorted sands and gravel. Thought to be formed from sediment deposited by a stream flowing within or beneath a glacier.
An esker is a sinuous ridge of stratified fluvial sediments deposited underneath a glacier in meltwater channels. These channels are initially eroded both into the underlying bedrock, but as the channel fills it begins to erode into the overlying ice while continuing to deposit sediments. When the ice retreats these channel deposits are left behind as topographic highs. Eskers vary greatly in size and extent, but can be 100 feet high and 100 miles long.
Keywords:  eschar, see
See Eschar.