ST. LAWRENCE COUNTY. 307 



dam sandstone, and tlie Calcifcrous sandrock ; the latter forming a belt about ten miles 

 wide on the St. LawTonce river, and the former another belt rather wider on the east. 



7. The rocks of St. Lawrence appear to have been subjected to two general forces at two 

 different eras: the first produced an uplift, which inclined the sedimentary rocks towards the 

 west, northwest and southwest, and the second raised up and gave to the sedimentary rocks 

 an eastern dip ; the first gave elevation to the whole country, and the last was connected with 

 the formation of the present channel of the St. Lawrence. 



8. The arrangement of the drift was described as lying in three parallel zones : the first con- 

 sisting of fine materials upon the Calcifcrous sandrock : the second coarser, upon the Potsdam 

 sandstone ; and the third, consisting of water-worn boulders, and coarse gravel in high banks, 

 on the edge of the latter rock and the Primary system. 



