. The Quarterly journal of the Geological Society of London. uring warm seasons, whenmuch snow was melting, gravel, sand, and other debris would bewashed down the hill-sides and lodge against the flank of the rivulets and streams woidd at such times come down from theneighbouring heights, carrying with them much matter of this present it all finds its way into the bed of the river; but when thechannel was occupied by a glacier this debris would be arrested bythe mass of ice and lodge in the depression between the glacier andthe hill (fig. 3). This hollow would therefore be
. The Quarterly journal of the Geological Society of London. uring warm seasons, whenmuch snow was melting, gravel, sand, and other debris would bewashed down the hill-sides and lodge against the flank of the rivulets and streams woidd at such times come down from theneighbouring heights, carrying with them much matter of this present it all finds its way into the bed of the river; but when thechannel was occupied by a glacier this debris would be arrested bythe mass of ice and lodge in the depression between the glacier andthe hill (fig. 3). This hollow would therefore be gradually filled upand might be traversed at times by streams of water. When theglacier melted, the mass of stuff resting against it would lose its sup-port and fall down in a steep slope, thus giving rise to the terracedbanks we now find (fig. 4). Fig. 3.—Section of valley with glacier in retreat. m. c. Glacier. a & b. Gravelly debris lodging between the glacier and the sides of the valley. Fig. 4.—Section of valley after disappearance of - >:
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
