View over crystalline shield terrain, Stockholm, eastern Sweden. The hill top is exposed bedrock without any sediment or soil cover. This bedrock landscape is typical of the intermediate zone of glaciation. Closeup view of thin moraine cover on lower portion of bedrock hill. The sediment is only one boulder-layer in thickness.
Glacial sediment forms a near-continuous cover in foreground.
Overriding ice molded the ice-pushed hill into a small drumlin. It is clear from this zonal pattern that evidence for past glaciation would most likely be preserved in the outer zone, especially on continental shelves and in adjacent marine basins, where deposits 100s of m thick could accumulate. Evidence for ancient glaciation would, conversely, consist of a vast erosional surface over much of the interior land area. View over Egersund, southwestern Norway. The crystalline bedrock was stripped of soft sediment cover during repeated ice-sheet glaciations.