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according accumulation action Alps already amount appear basin become beneath blocks boulder clay called climate coast comparatively considerable containing course covered débris deposits descend difference difficulties direction distance district Drift Edition elevation England erratics evidence existence extend facts fall feet former fragments Geol geologists Glacial Epoch glaciers Glen gravel greater Greenland ground height higher hills hypothesis ice-sheet Illustrations important indicate instance islands lakes land larger latitude latter length less localities lower lowlands marine marked mass material mean mentioned miles moraine mountain nearly neighbourhood northern numerous occasionally occur origin parallel pass places present probably produce Professor range reach regard region ridges rise river rock sand sea-level seems seen showing side similar slope snow sometimes southern stones streams supposed surface temperature thickness traced upper valley vary Wales western whole yards
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.