Ablation till and related indicatory form at the margins of Vestspitsbergen glaciers

The marginal zones of three Vestspitsbergen glaciers have been studied. Two main types of ablation till and related forms are distinguished: (1) ridges, cones, and troughs aligned parallel to the glacier margin (controlled or structural forms), formed of locally derived material and resulting from compression flow, and (2) an irregular debi-is cover (non-controlled or non-structural), formed through extensive or balanced flow from material transported englacially over a longer distance.