Ice-work, Present and PastKegan Paul, Trench, Trübner, 1896 - 295 pagini |
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Pagina 43
... Nunataks , as these projecting summits are called , visited by Nansen , are about 47 miles from the edge of the ice , and are about 5400 feet above the sea , the level of the ice surface being about 4200 . 2 The “ divide ” ( practically ...
... Nunataks , as these projecting summits are called , visited by Nansen , are about 47 miles from the edge of the ice , and are about 5400 feet above the sea , the level of the ice surface being about 4200 . 2 The “ divide ” ( practically ...
Pagina 44
... Nunataks " begin to emerge from the ice and to rise above its surface like islands from sea . On approaching these from the interior , the undulations of the snowfields assume a more definite plan , and their slopes converge towards a ...
... Nunataks " begin to emerge from the ice and to rise above its surface like islands from sea . On approaching these from the interior , the undulations of the snowfields assume a more definite plan , and their slopes converge towards a ...
Pagina 45
... Nunataks " in the direction of the great effluent , the surface of which is already lying at a lower level . Thus the offshoot becomes relatively a tributary glacier , though from a common source , and the result of this is curious . No ...
... Nunataks " in the direction of the great effluent , the surface of which is already lying at a lower level . Thus the offshoot becomes relatively a tributary glacier , though from a common source , and the result of this is curious . No ...
Pagina 46
... Nunataks " toward the surface of the trunk - stream below , and on this surface , which it had just succeeded in reaching , it had deposited its terminal moraine ; this , however , as few blocks , if any , came from the adjacent " Nunataks ...
... Nunataks " toward the surface of the trunk - stream below , and on this surface , which it had just succeeded in reaching , it had deposited its terminal moraine ; this , however , as few blocks , if any , came from the adjacent " Nunataks ...
Pagina 74
... Nunataks " on the ice - field . He also describes some facts which may be helpful in explaining certain ridges , called " kames " or " eskers , " which are mentioned in a subsequent chapter . When the streams from the north reach ...
... Nunataks " on the ice - field . He also describes some facts which may be helpful in explaining certain ridges , called " kames " or " eskers , " which are mentioned in a subsequent chapter . When the streams from the north reach ...
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Termeni și expresii frecvente
Alpine Alps amount angular basin beds beneath boulder clay breccias Carboniferous chalk chap cliffs climate coast comparatively considerable contour crags débris descend direction distance district Drift Edition elevation England Eocene erratics favourable feet above sea-level fragments Geol geologists Geology Geology of England glacial deposits Glacial Epoch glaciers Glen Roy granite Greenland ground height higher hills hypothesis Ice Age ice-sheet ice-streams inches indicate inland ice Irish Sea islands Jour lakes land land-ice latitude latter less lower lowlands Malaspina Glacier marine mass material melting miles Moel Tryfaen molluscs moraine mountain nearly neighbourhood névé northern Norway numerous Nunataks occasionally occur parallel pebbles precipitation present probably Professor Quart range region ridges rise river roches moutonnées sands and gravels Scotland shells side slope snow snow-line sometimes southern stones stratified streams striated subangular submergence surface temperature terminal moraine thickness traced upper valley Wales western yards
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Pagina 59 - It was a beautifully clear evening, and we had a most enchanting view of the two magnificent ranges of mountains, whose lofty peaks, perfectly covered with eternal snow, rose to elevations varying from seven to ten thousand feet above the level of the ocean. The glaciers that filled their intervening valleys, and which descended from near the mountain summits, projected in many places several miles into the nea, and terminated in lofty perpendicular cliffs.
Pagina 75 - ... thus building up their channels and obstructing the outlets of the tunnels. The blocking of the tunnels must cause the subglacial streams to lose force and deposit sand and gravel on the bottom of their channels ; this causes the water to flow at higher levels, and coming in contact with the roofs of the tunnels, enlarges them upwards ; this in turn gives room for additional deposits within the ice as the alluvial cones at the extremities of the tunnels grow in height. In this way narrow ridges...
Pagina 59 - The glaciers that filled their intervening valleys, and which descended from near the mountain summits, projected in many places several miles into the sea, and terminated in lofty perpendicular cliffs. In a few places the rocks broke through their icy covering, by which alone we could be assured that land formed the nucleus of this, to appearance, enormous iceberg.
Pagina 72 - Besides the shells of molluscs, there are the shell-cases of annelids (serpulce?), attached to glaciated boulders, showing that the stones on which they grew must have remained exposed at the bottom of the sea for some time before being wholly buried.