38 
Records of the Geological Survey of India. 
[.VOL. VII. 
the rook has sometimes a very trappean aspect, and I am not sure that some of 
it is not trap, either contemporaneous or more probably in dykes parallel to the 
foliation. A very clear-cut line of demarcation between it and the quartzite is 
sometimes visible, and that there is more or less trap hereabout is certain from 
an observation on the top of the ghat which crosses the quartzite ridge north 
of Pliulwaria. Here a band of greenstone, about 15 inches broad, is seen run¬ 
ning N. 10° E., or nearly at right angles to the strike of the quartzite. It can 
only be traced for 10 or 15 feet, but is clearly a dyke. 
f. —Quartzite similar to c. 
g. —Hornblende rock and schist with mica-schist, &c., similar to d. 
It .—Quartzite similar to c. 
i. —A very thick band of hornblende rock and schist. Much of it is of the former 
variety; but the schistose structure is very common also, and the rock sometimes 
contains a considerable amount of quartz in seam-like nests here and there. 
j. —A broad band of schistose, micaceous quartzite. It is coarsely granular, and much 
softer than the quartzites to the north, so that it does not, like them, rise into a 
lofty ridge. It contains a good deal of interbanded mica-schist, and the mica- 
schist to the south (£) contain subordinate layers of quartzite, the two rocks not 
being clearly demarcated from each other. 
h. —Mica-schist, passing in places into arenaceous schist, and thence into micaceous 
quartz schist. No distinct line can be drawn between these, but the main mass 
of the rock is mica-schist. Along the southern face of the hills it is full of 
small crystals of garnet and andalusite, the latter sometimes so plentiful as in 
weathering out to cover the surface with gravel. 
I .—Gangetic alluvium of the Sakri valley. 
The quartzites d, f, and h of the above section form three lofty parallel ridges (the 
valleys between being occupied respective]}' by the beds e and g), and the possibility of 
their being in reality the same beds repeated by folding at once suggests itself. Detailed 
examination of the range, however, did not lead me to adopt this view. 
In following the strata towards the west, e and g are found to disappear, and the three 
quartzite ridges join into one, in which d, f, and h, may be, and probably are, all represented. 
The hornblendie band i also thins out in the same direction, and where the Sakri river cuts 
through the range, nothing but quartzite rises above the level of the alluvium, forming a 
ridge of greatly reduced elevation. A few miles further on, Mr. Medlicott found it gradually 
to come to an end also. 
To the east, again, we find a great twist in the strata at Dhubni, and e andy can only be 
traced a short distance beyond this point; hornblende rock, however, is again visible on the 
top of the ridge east of Mokrumo; i and j also thin out to the east, so that at Nurpani 
H. S. and beyond, the range is again reduced to a single band of quartzite. 
It will be observed that all along tho B hi aura range the strike of the foliation 
of the schists corresponds with the direction in which the different alternations of 
rocks themselves run. Generally speaking, the bedding and foliation of the mica-schist 
lie in the same plane, although instances are not unfrequent in which they do not 
do so. In the former case, the rock has a tendency to weather into more or less slab-like 
pieces, whilst we find it to split much less easily where the foliation and bedding differ, and to 
weather into featureless hillocks, like those of Dumdum a (sheet 7). 
