moraine
moh-RAIN
A ridge or mound of rock, gravel, and debris deposited by a glacier — the rubble it carried, pushed, and left behind. Terminal moraines mark the farthest advance of the ice. Lateral moraines line the valley walls. Medial moraines form where two glaciers merge, their lateral moraines combining into a dark stripe running down the center of the combined flow. Moraines are the glacier's autobiography, written in stone.
Etymology
Savoyard French moraine, meaning a mound or hill. The word is Alpine in origin and entered English through 18th-century geological writing about the Alps.
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