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The Ice Age in North America, and Its Bearings Upon the Antiquity of Man ...
George Frederick Wright
Volledige weergave - 1889
accumulations American Journal amount basin Boone county bowlders Cascade Range channel cial coast continuous coteau Creek debris Delaware depression depth distance drainage drift drumlins east eastern elevation erosion evidence extended facts farther feet above tide formed Fort Snelling Geological Society Geological Survey geologists glacial action glacial boundary glacial deposits Glacial epoch Glacial period glaciated area glaciated region glacier gorge granitic gravel Greenland height hills hundred feet ibid Ice age ice-front ice-sheet icebergs implements inlet Island Journal of Science kames kettle-holes Kittatinny Mountain Lake Erie latitude loess lower margin marked mass material melting miles Minnesota Mississippi mountains movement Muir Glacier North America northern northward numerous Ohio Ohio River pebbles portion preglacial present Professor Report ridges River rock Rocky shore side slope southern streams summit surface terminal moraine terraces theory thickness thousand feet tion transported upper valley vicinity Washington Territory
Pagina 81 - Imagine now the centre of such a continent, occupied through nearly its whole extent by a deep unbroken sea of ice, that gathers perennial increase from the water-shed of vast snow-covered mountains, and all the precipitations of the atmosphere upon its own surface. Imagine this moving onward like a great glacial river, seeking outlets at every fiord and valley, rolling icy cataracts into the Atlantic and Greenland seas ; and, having at last reached the northern limit of the land that has borne it...
Pagina 295 - Seen from some dominant point, such an assemblage of kames, as they are called, look like a tumbled sea, the ground now swelling into long undulations, now rising suddenly into beautiful peaks and cones, and anon curving up in sharp ridges, that often wheel suddenly round so as to enclose a lakelet of bright, clear water.
Pagina 83 - I have named after the Advance. From one of these rugged islets, the nearest to the glacier which could be approached with any thing like safety, I could see another island larger and closer in shore, already half covered by the encroaching face of the glacier, and great masses of ice still detaching themselves and splintering as they fell upon that portion which protruded. Repose was not the characteristic of this seemingly solid mass; every feature indicated activity, energy, movement.
Pagina 109 - Parrsborough, and that the icy blocks, heaped on each other, and frozen together or ' packed,' at the foot of Cape Blomidon, were often fifteen feet thick, and were pushed along when the tide rose, over the sandstone ledges. He also stated that fragments of the
Pagina 514 - The general structure of the mass is neither that of ordinary boulder clay nor of stratified gravels, such as are formed by the complete rearrangement by water of the elements of simple drift deposits. It is made up of boulders, pebbles, and sand, varying in size from masses containing one hundred cubic feet or more to the finest sand of the ordinary sea-beaches.
Pagina 540 - ... it in Freeborn and Faribault counties. The fifth or Elysian moraine, crossing southern Le Sueur county, Minnesota, marks the next halting-place of the ice. At the time of formation of the fifth moraine, the south end of the ice-lobe had been melted back a hundred and eighty miles from its farthest extent, and its southwest side, which at first rested on the crest of the Coteau des Prairies, had retired thirty to fifty miles to the east side of Big Stone lake and the east part of Yellow Medicine...
Pagina 75 - On ascending a high craggy hill to the northward, I had a sublime prospect of this great frozen ocean, which seems to form the continental axis of Greenland, —a vast undulating plain of purple-tinted ice, studded with islands, and absolutely gemming the horizon with the varied glitter of sun-tipped crystal.
Pagina 95 - The lofty mountains boldly rise to a height of between three and four thousand feet. They are covered by a wide mantle of perpetual snow, and numerous cascades pour their waters through the woods, into the narrow channel below. In many parts, magnificent glaciers extend from the mountain side to the water's edge. It is scarcely possible to imagine anything more beautiful than the beryl-like blue of these glaciers, and especially as contrasted with the dead white of the upper expanse of snow.