RESULTS. 101 



chak E. G. and by an outcrop of dachsteinkalk in the Spiti shales two 

 miles north of this E. G. The latter outcrop may be an inlier of the 

 upper triassic limestone of Peak Chaldu No. 2. 



One of the three small blocks is of permo-carboniferous age (not 

 mapped) the other two ' are lower muschelkalk with Monophyllites, 

 Xenaspis, etc., developed in a Hallstatt facies. 



Diener's description no doubt disagrees in most important respects 

 with the theory I have advanced above. He speaks here again of in- 

 trusive rocks and recognises a semi-circular arrangement of the exotic 

 blocks, to which he attributes great structural importance. 



Great weight is attached both by Mr. Griesbach and Dr. Diener to a 

 dyke seen in the block that makes up Chirchun No. 1, and this is taken 

 as a proof of the intrusive character of the igneous rocks, which are 

 asserted to traverse in succession both the Spiti shales and the 

 block. 



I have no doubt this dyke answers to the veins so often seen in the 

 exotic blocks of Johar, and altogether the feature appears to be 

 exactly the same as elsewhere, a limestone block with intrusive veins 

 resting on volcanics by which its top is also covered. That the 

 igneous rocks should pierce through the Spiti shales is not compatible 

 with the results of my own observations, all accounts pointing to the 

 conclusion that the sources of discharge of these rocks lie elsewhere. 

 If there were a dyke in the Spiti shales, one should expect it to be very 

 clearly seen as the igneous rocks are harder than the shales. Nothing 

 of the sort has been recorded. 



Diener deems the semi-circular arrangement of the exotic blocks 

 to be of vital importance, on the grounds that the rows run diagonally 

 to the direction of the Himalayan folds outside the Chirchun area. 



The northern and southern rows are too indistinct to deserve much 

 attention, but the " central row " can to a certain extent be recog- 

 nised in Diener's and Griesbach's maps, although the two maps differ 

 in detail. It is on these maps pretty well pronounced from Chirchun 

 No. 1 north and north-eastwards, but to the south-west of that peak it 



1 Copied from Diener, not shown by Griesbach. 



( 55 ) 



