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These signs consist chiefly of polished and furrowed rock-surfaces, of moraines and erratic blocks.
We still detect the grooves and scorings on the rock-surfaces where they have been protected by a coating of boulder clay; and we still find the surface strewn with the blocks and débris of that mighty ice-flood. But whatever may have been the amount of erosion caused by the great ice-sheet, it was chiefly confined to the more or less horizontal surface-planes.
Exposed rock-surfaces are ground and scratched, beds of pebbles are twisted and contorted hollows are scooped out, and moraines the rubbish-heaps of the glaciers are found on every side.
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