Subglacial debris
Debris which has been released from ice at the base of a glacier. Individual stones usually show signs of rounding as a result of abrasion at the contact between ice and bedrock.
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Taylor Glacier, Victoria Land, Antarctica, showing the formation of subglacial debris (basal till) that has melted out from the dark striped basal ice layer. Photo M. J. Hambrey, 1987. |