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.
Its front rested on Staten Island and Long Island, whose surface features, and a part of whose area, are due to the deposits along the ice front, including terminal moraines and outwash gravel plains.
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