EAFFRARIAN GEOLOGY. 
189 
logist as he travels along the Eastern coast of 
Africa, in the districts of George ; then disap- 
pearing, it next rises to view in the lofty moun- 
tain above Graham's Town, known as " Go- 
vernor's Kop." Traversing a few miles of 
country here, it gradually falls at Frazer's 
Camp Hill, and is not again perceived until he 
reaches Mount Coke, a high hill situated about 
three miles to the Eastward of Fort Murray ; 
on which is established the large Wesleyan 
Missionary station, which is known by that 
name. The rock here disappears as abruptly 
as it rose to the surface, and is finally found to 
die away into the interior of the earth, on the 
banks of the Q'nahoon river, near to the old 
Fort Waterloo. After being here lost, it is not 
again seen anywhere along the Eastern coast, 
either through Kaffraria or Natal. 
Pure granite is of very rare occurrence, al- 
though a stone, not unfrequently mistaken for 
it, is common. This is a kind of trap, which, 
in Scotland is called when-stone, and some- 
what resembles the hard blue lias of Somerset- 
shire. A large proportion of felspar and talc 
is interspersed through it, combined with a spe- 
cies of thin quartz. 
Along the coast-line, sand-stone is largely 
scattered, whilst iron-stone is the principal fea- 
ture in the formation. The mountains and hills 
