PLATE 10 
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G. S.) contour map, illustrating the 
topography of the Highlands of the Hudson. The river here flows through 
a deep, narrow gorge which has been cut through the northeast-southwest 
ridges of very hard Precambric rock. The sides of the gorge rise abruptly 
from the river to heights of 1200 or 1400 feet, while the rock bottom of the 
pores i hundreds of feet below the river level. Scale, about 1 mile to 
the inch. 
