GRANITE AND SANDSTONE. 
furnished from the detritus of limestone-rock, in the pass>- 
age of the mountain-torrents over them, at no great distance 
from the head of the river, or at least within the first range 
of hills. 
Near the town of Jubbulpore, we pass a ridge of granite 
rocks or hills, which resemble those first met with in Bundle- 
cund, but which do not rise to the same height, and are less 
conspicuous from the greater continuity which they observe^ 
Many of the masses approach to the gneiss formation, and 
they seem in general to be suifering a rapid decomposition. 
The cantonments at Jubbulpore are situated to the east and 
south of the town, on an open plain, which bears only a 
coarse grass, and a fcAv shrubs or frutescent plants, if we 
except a decaying mango-grove in the centre of the build- 
ing. The district around is rocky, and offers a fine field 
for the geological inquirer ; but my short stay would only 
admit of a very cursory glance over it. A formation of 
sandstone, directly south of the cantonment, which appears 
to have been extensively quarried, has the peculiarity of 
being arranged in strata perfectly vertical, contrary to what 
is usually observed in the rock. A large mass of a whitish 
clay-rock, containing quartz-pebbles, forms the base of the 
hills, to the east of the plain. It appears to be washed 
down by the rains into powder, and formed anew into a 
boulder, or a cake, at the surface. The ridge lying over 
this, north and east, displays the primitive outline ; and 
hence, I conclude, consists of the same granite-blocks which 
are observed at the entrance to the town from the north. 
At Jubbulpore, we enter upon the great valley of the 
Nerbuddah, extending from the Forty Mundelah to be- 
yond Hindra, through a space of at least 250 miles. The 
river, where we cross it at Tetwarra Ghaut, is a clear 
mountain-stream, not much wider than the Cane at Kopah, 
but of greater depth, being seldom fordable here before the 
