RELATIVE HEIGHTS OF THE HILLS. 
51 
with slight deviations, the whole body of this stratum 
is flat and horizontal, scooped out however, in some 
spots, to afford passage and space to rivers and 
creeks, but still generally presenting to the view a 
horizontal plane, or plateau about a half mile in 
breadth, including the spaces overspread by w r ater 
The accompanying cut shews a cluster of slate hills 
rising gradually in the back ground, and joining in 
the fore ground to a lime ridge, distinguished at 
once by its horizontality. 
