64 SUB-HIMALAYAN ROCKS OF N. W. INDIA. [CHAP. II. 



with red and blue shaly slates, and quartzose sandstone. These rocks, here 

 as elsewhere, exhibit much local disturbance, though with an average 

 underlie to north-north-east ; the passage from them into the siliceous 

 schists, alternating with porphyritic gneiss, is badly seen along the path. 

 From about three miles north of Choari to where the gorges on the north 

 of the ridge open into the valley of the Ravee, near Chumba, there is an 

 unbroken section of more or less granitoid and gneissose rocks, in every 

 portion of which a north-easterly underlie can be easily distinguished. 

 Along the border of the valley of the Ravee there is a narrow skirting 

 of fine mica-schist over the gneissose series. The section is then covered 

 by the valley deposits, as far as the Ravee, at Chumba,. where we find 

 dark, and light-gray, thinly-bedded, sub-schistose slates, with courses of 

 thin quartzose grits, having a steady dip of 70° to north-east ; — a group of 

 rocks much resembling the series already spoken of as the Simla slates or 

 Infra-Blini series. I have little doubt that these are the rocks that I noticed 

 to the north of the ridge from the Murrumghattee, over Dhurmsala. 



In this section of the Dhaoladhar, by the Choari pass south of Chumba, we have just 

 seen a band, about eight miles broad, of granitoid and gneissose rocks, the same as those we 



Termination of granitoid band have traced for man y miIes from the south-east, and extending 

 at Daihousie. to an un known distance in the same direction ; being in about 



the lineal continuation of the great chain of sdowv peaks beyond the Sutlej,. which, we 

 know, have similar geological characters. Yet within ten miles to the west of this Choari 

 section the whole mass has disappeared. The station of Daihousie stands at the very 

 extremity of this band of crystalloid rocks, forming the core of the Dhaoladhar. The mode 

 of disappearance is important ; it corresponds very exactly with analogous features noticed 

 elsewhere. On Dainkhund, the summit, nine thousand feet high, to the cast of Daihousie, the 

 granitoid gneiss shows a general easterly underlie. Low down on the northern spur from 

 Dainkhund, along the road from Chumba to the plains, the last remnant of the central gneissose 

 band is crossed. The slates of the Chumba valley are in contact with it at about the bifurcation 

 of the lateral gorge, south of Mila, having maintained a steady average north-easterly dip ; 

 the schistose gneiss nearest to the junction shows a dip of 50° to the east-north-east, which is 

 continued on the spur about Dhar ; down this spur the baud contracts, and to all appearance, 

 as seen from this place, it becomes extinct before reaching the Ravee, on the right bank of 

 which there seems to he a continuous section of thin-bedded crumbling strata. On the short 

 secondary spur over Gurvval the schistose slates come in, on the west of the granitoid band, — 

 fine-grained, gritty, sub-schistose, greenish gray slates, having a steady dip of about 60° to the 

 east-south-east, towards the centre of the ridge, the strike being parallel to what is here the 



