Wat mensen zeggen - Een review schrijven
We hebben geen reviews gevonden op de gebruikelijke plaatsen.
Overige edities - Alles weergeven
accumulations action already America amount appear bowlders cause changes channel close coast considerable continuous course covered Creek deposits depression depth described direction distance drainage drift east eastern elevation epoch erosion evidence existence extent facts Falls fifty five flow formation formed four front Geological Glacial period glacier gravel half height hills hundred feet ice-sheet icebergs implements Island Lake land latitude less limit lower margin marked mass material melting Michigan miles Mississippi moraine mountains movement moving Natural nearly northern numerous observed Ohio origin passed places portion present probably Professor range reached region remarkable Report ridges rise River rock running Science seems seen shore showing side similar slope southern stone streams surface Survey terminal terraces theory thickness thousand tion transported United upper valley vicinity whole
Pagina 85 - 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 335 - flats ' is 275 feet above the river, or 1065 feet above tide. The deposits on this area consist almost entirely of clays and fine sandy material, there being very few bowlders intermingled. The depth of the deposit is unknown, since a well sunk on the land of Mr. Baker passed through alternate beds of clay, fine sand, and muddy trash to a depth of 65 feet without reaching bed rock.
Pagina 87 - 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 113 - 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 34 - ... but containing goodsized lumps of clear ice. There seemed no reason to doubt that an extension of the digging would have brought us to solid, clear ice, such as was visible at the face of the bluff below.
Pagina 518 - 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 379 - ... probability when we claim not a few of them as the originals of present species. Remains of the same plants have been found fossil in our temperate region, as well as in Europe. Here, then, we have reached a fair answer to the question how the same or similar species of our trees came to be so dispersed over such widely separated continents.
Pagina 85 - The interior, with which it communicated and from which it issued, was an unsurveyed mer de e/lace — an ice-ocean, to the eye, of boundless dimensions. It was in full sight — the mighty crystal bridge which connects the two continents of America and Greenland. I say continents ; for Greenland, however insulated it may ultimately prove to be, is in mass strictly continental. Its least possible axis, measured from Cape Farewell to the line of this glacier, in the...
Pagina 99 - 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.