Hart, Jane K.
Athabasca Glacier, Canada – a field example
of subglacial ice and till erosion?
Earth Surface Processes and Landforms, 31, (1), . (doi:10.1002/esp.1233).
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The Athabasca Glacier, resting on a rigid bed, provides an excellent example of subglacial
ice and till erosion. The presence of a thin mobile till layer is shown by the presence of flutes,
saturated till layer, push moraines and ploughed boulders. Cross-cutting striations, v-shaped
striations and reversed stoss-and-lee clasts are indicative of clasts rotating within this layer.
As the till moves it erodes the bedrock and clasts within it. A combination of erosion by ice
and till produces stoss-and-lee-clasts and generates striations on flutes and embedded clasts,
as well as eroding the bedrock into a continuum of smoothed, rounded and streamlined forms.
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