Essay, &c. 265 
through each other without any determinate or- 
der: the separate fragments had rolled down, 
and were found at the banks of the river, and 
bold strata extended into it and formed part of 
its basin ; the arrangement of the separate nodules 
was in concentric layers, but on being taken 
irregular concave lamina. The predominant 
color of the fracture was blueish-grey, exter- 
nally most of the fragments were covered with a 
dirty yellowish ochreous crust: they slightly 
adhered to the tongue. 
In attempting to ascend the hill, the various 
masses rolled under the foot and carried one 
o 
rass. Some yards North of the groupe of 
grey rocks, at the base, in contact with the 
river, a mass was deposited which approached f 
the nature of sandstone: the portions which 
composed it had a disposition to separate in a 
more determinate angled manner, forming cu- 
boid or trapizoid fragments, not unlike the con- 
figuration of many of our basaltes: the fracture 
was bluish and compact, and they were covered 
with a yellowish crust. A simple sandstone was 
also occasional found in contact with the 
other assemblages UAR this hill, resembling 
the grey rock a the base, buc without any ad- 
mixture of s ; 
The district Of Passir extends to that part 
-of the foot of the mountain where the acclivity 
* Exp. Cat. No. 35. 
+ Exp. Cat. No. 36. 
Rs 
