Long, skinny, steep-walled sinuous deposits of irregularly
stratified sand and gravel deposited by subglacial or
englacial streams. The streams may have been located between
the glacier and rock walls or bases, on top of the glacier, or in
tunnels within the glacier. Eskers are typically a few to 650 feet
(1–200 m) high and range in length from about 300 feet to
310 miles (100 m–500 km). They typically show branching
patterns reflecting where streams flowed together into a single
channel. Beaded or lobate eskers are a rare geomorphic type of
esker, forming where ice flowed into a lake.
See also GLACIER.
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