Chap. II] the Himalayan series. S3 



Under that portion of the Simla ridge known as Boileaugunge, on one 



of the northern spurs, about 600 feet below the 

 Blini rocks at Simla. 



house called the Yarrows, we find a limestone 



and a grit conglomerate answering exactly to the description I have 



given of the Blini rocks, and which I cannot hesitate to identify with 



that group. At the place indicated these beds have a .moderate dip to 



the south-south-west, which is the general dip all along the ridge at 



Simla. On the south-south-east spur from Jako, known as Chota Simla, 



at a small distance below the ridge on the north-east side, the same 



beds crop out. I noted both these localities in going to visit the slate 



quarries. 



The material used so generally at Simla as roofing slate is an 



imperfect lamination-slate, or indurated shale, 

 Simla slates. 



obtained always from below the Blini beds ; it 



is a finer variety of a great series of shaly slates, grits, and thin, 

 fine, earthy sandstones, that are well seen in the downward conti- 

 nuation of these local sections at Simla, steadily underlying the 

 supposed Blini beds. The strata being far less disturbed here than 

 along the outer zone, these slates must, I think, be taken as the 

 undoubted basis of the Blini beds ; they are in every way similar to 

 those often seen with the Blini rocks about the Krol. These Simla 

 slates are quite free from carbonaceous colouration, and it may be that 

 this character is peculiar to the otherwise similar beds which inter- 

 vene between the Blini and the Krol groups, and which I have desig- 

 nated the Infra-Krol band. If this inference be correct, this carbonaceous 

 character would occasionally be a useful means in helping to distinguish 

 between groups of strata that are in other respects very similar. 



Any geologist who had only studied the Simla rocks as seen on 



the top of the ridge, along the roads and paths 

 Simla ridge. 



about the station, would be surprised to be told 

 that these upper strata were underlaid, right through the hill, by 



E 



