Gradually coming to occupy definite beds, which are deepened and polished by the friction, they impress a characteristic appearance on the land, which guides them as they traverse it, and, although the ice melts at lower levels, vast quantities of clay and broken stones are brought down and deposited in terminal moraines where the glacier ends.
Glaciation was formerly much more extensive, old moraines being observed down to 12,000 ft.
The presence of enormous glaciers in the Ice Age is attested by the moraines at the Atlantic end, and by other indications farther east.
Numerous glacial marks, however, such as polished striated rocks, moraines, erratic blocks, &c., prove that the whole of Greenland, even the small islands and skerries outside the coast, has once been covered by the inland ice.
Nor is there any sign of moraines, glacier-scorings or other traces of the ice-age.
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