282 TRANS. OF THE ACAD. OF SCIENCE. 
are in all respects similar to those of the mountains, a portion 
of the western slope of which they, at one time, 
though, at present, separated by a deep valley several miles | 
wide. Facing, also, in an easterly direction, and about about fifteen 
miles to the southwest, there occurs an oxteasiag range of 
rugged cliffs, from the summits of which the sapiens 
gently towards the west. These cliffs, as well as 
etermined from a 
4 eat shcough:.thie valley, we. emerged into 
gently undulating country, the surface 0 
chiefly of tenac red, caleareo- 
st tothe thekness of sobs en sie "Some 
