1. After the ice has gone (retreating glacier), the position of a former ice tunnel is marked by a long, sinuous ridge of sediment known as an esker (stream-bed deposit remains, forming a ridge). Eskers are long sinuous ridges of sediment deposited by streams that ran under or within a glacier. The sediment deposited by these streams becomes an esker after the ice has melted.
      • Sinuous ridges of stratified till
      • Form in tunnels under the ice sheet
      • Some times 100 km long or more
      • They follow the general follow the general ice flow direction.

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