ST. LAWRENCE COUNTY. 
367 
dam sandstone, and the Calciferous sandrock; the latter forming a belt about ten miles 
wide on the St. Lawrence 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 Calciferous 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. 
