NtJRPUR PLATEAU. 189 



to eighteen hundred feet, and its width, at one place midway up, is only 

 three-quarters of a mile. Just within its mouth is a narrow throat or 

 gorge, entering between high under-cliffs of the purple sandstone group, 

 which approach so closely that there is no room left for the salt 

 marl, although this crops out both before entering and after passing 

 the throat. 



Beyond the narrow portion the ravine opens to a width of more than 

 a mile, and above the purple sandstones of the 



Scries of Nilawan. 



eastern side, which are lully 400 feet or more m 

 thickness, and of lighter colour towards the top, the dark, lumpy, 

 micaceous shales of the zone No. 3 are seen, with a thickness of 90 or 

 100 feet. Over this band are 50 feet of light-coloured sandstones, 

 alternating above with three bands of dark shale having a thickness 

 of some 80 or 90 feet, and an aspect very similar to those below. The 

 thick speckled sandstone and red shale group succeeds, and then comes 

 the talus, a high clifl" of nummulitic limestone rising above all. 



Down in the gorge, just here, and in the narrow part beyond, there 

 is evidence of extreme crushing, and a crooked bifurcating fault occurs, 

 the displacement accompanying which does not appear to be great. 



The angle formed by the branching of this fault is occupied by the 

 purple sandstone, on the left bank of the stream vertical, and striking 

 west-north-west to north-west ; while on the right bank it is nearly hori- 

 zontal, dipping at a low angle into the hill. 



On the western side of the gorge, at the same place, the lower part 

 of the section is, as before mentioned, the purple 



AVcst side 01 £*or2['G 



sandstone, which is somewhat contorted, and the 

 group No. 4 only slightly represented, if at all, but high up beneath 

 the limestone cliffs some of the intervening beds between it and the 

 '' speckled sandstone " are exposed, a new member of the series having 

 made its appearance. The same rocks occur also in the Bhal arm of 

 the gorge at right angles to, and on the west side of, the main glen. 



( 189 ) 



