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A winding ridge marking a subglacial stream bed.
Also known as: Esker ridge symbol, Subglacial stream deposit
On a geological map an esker is drawn as a long winding ridge, marking sediment deposited by a stream running beneath a glacier.
Marks a sinuous ridge of sediment laid down by a stream flowing under a glacier.
Contexts: Maps
Winds because it follows a former watercourse, which is why an esker crosses hills and valleys that a surface stream would have gone round.
Contexts: Maps
A long sinuous ridge line winding across the map, narrow relative to its length.