Mountain glacier in the French Alps. Note meltwater stream and debris. Glaciers carry debris on their surfaces in conveyor-belt fashion. Outwash at the toe of a glacier. Debris is deposited and re-worked by streams.
Glaciers can carry extremely large boulders.
Glacially deposited clasts that are unlike the local rock type are called erratics. Lateral moraines form on the sides of active glaciers, while medial moraines form where two glaciers merge. Two well-defined terminal moraines can be seen on the valley floor. Striations are left on rock surfaces as the ice sheet drags rocks and other debris across them. U-shaped valley in central New York.