By Clifford Embleton (eds.)
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Extra info for Glaciers and Glacial Erosion
It is so fine as to be scarcely depositable. No one who drives from Avignon to Vaucluse can fail to be struck with the contrast of the streams, artificially conveyed on one and on the other side of the road, in order to irrigate the parched plain of Provence. The one is the incomparably limpid water of Petrarch's fountain; the other an offset from the river Durance, which has carried into the heart of this sun-burnt region the unequivocal mark of its birth amidst the perpetual snows of Monte Viso.
In a mature stage of dissection mountains should exhibit a well-advanced grading of their slopes; that is, their sides should be worn back to a comparatively even declivity with little regard to diversity of structure; the descending streams of waste being thus seen to correspond to the flood plains of graded rivers. The agencies of weathering and 50 William Morris Davis transport are delicately balanced wherever graded slopes prevail; and a slight tilting of the mountain mass might suffice to disturb the adjustment between the supply and the removal of waste; then all the steepened slopes would soon be more or less completely stripped of their waste cover; their rock ledges would be laid bare, although still preserving the comparatively even declivity that had been gained under the slowly moving waste.
I had not failed to point out, when I proposed the determination of the velocity of different points of a glacier, as a test of the cause of its motion, that this must depend materially upon the form of its section at different parts. The velocity of a river is greatest where it narrows, and is small in the large pools. Just so in the Mer de Glace. It is truly a vast magazine of ice, with a comparatively narrow outlet, as the map distinctly shows; the two glaciers of the Geant and Lechaud, Survey of the Mer de Glace 31 uniting just above the strait formed by the promontories ofTrelaporte and the Couvercle.