202 



PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. 







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trated on the lower than on the higher 

 terraces. Many of the blocks are 

 rounded ; in this respect differing 

 markedly from the majority of those 

 on glaciers, in moraines, and probably 

 from those transported by icebergs, 

 which, derived from glaciers that 

 reach the sea-level, obtain their debris 

 by the fall of rocks and stones on their 

 surfaces from inland cliffs. In the 

 American hills which I saw, there are 

 no signs of true glaciers like those of 

 the Alps having existed; and the 

 boulders have been transported by 

 floating ice from old sea-shores, where 

 they had been long exposed to the 

 washing of the waves. 



At Hawksbury Mills I crossed the 

 Ottawa with Sir William Logan, and 

 penetrated part of the Laurentine hills 

 lying several miles from the north 

 bank of the river. Waterworn gravel 

 here and there rises nearly to their 

 summits, now rarely more than 500 

 or 600 feet above the river. 



In the range about eight miles 

 north of the Ottawa, there are well- 

 rounded and occasionally grooved sur- 

 faces of gneiss, greenstone, and quartz- 

 rock, — the striations, where I saw 

 them, running 10° and 20° W. of S. 



In many places, among the hills, 

 numerous half-rounded boulders (of 

 the same substances as those that 

 strew the plains of the Ottawa and 

 the St. Lawrence) cover the ground, 

 and appear as if they had been 

 waiting their turn for glacial trans- 

 portation, ere the country was raised 

 above the sea. These general signs 

 existing in this chain, in latitude 45-i-° 

 !N"., gave me more perfect confidence 

 in the universal glacial abrasion of 

 the hills on the coast of Labrador in 

 a latitude nearly 150 miles further 

 north. 



Glacial Drift of the Plains ; Strice; 

 and Roches moutonnees. — I need not 

 indulge in repeated descriptions of the 



