RESULTS. 183 



(Griesbach, 1. c, p. 23) offers no objection to this hypothesis, as it 

 may well have been brought about subsequently. 



In cases where no lavas are recorded, they must either have 

 been decomposed beyond recognition, the origin of the blocks being 

 then possibly as pointed out above, or else such blocks have been 

 isolated completely from the igneous rocks by disturbances, in a 

 similar way as the large block No. 9 near Kiogarh Chirchun E. G. 



Thus I do not think that any of the facts recorded from the 

 Chirchun area can be said to be in discord with the explanation 1 have 

 given for the origin of the exotic blocks. 



I therefore come to the conclusion that the exotic blocks of Johar 

 and Chirchun have nothing whatever to do with the " Klippen " of 

 Europe. Beyond a certain similarity in appearance no affinity can 

 be discovered between them. While none of the European occur- 

 rences is connected with igneous rocks, their origin being according 

 to all accounts due to structural causes, the exotic blocks of Tibet and 

 the adjoining frontier districts are intimately connected with volcanics 

 and owe their existence to volcanic action. 



I am however well aware that no completely satisfactory solution 

 of this problem has yet been obtained. Not only are the sources of 

 discharge of the volcanics unknown, but also the facies of the exotic 

 limestone blocks is still a mystery, which is far from being satis- 

 factorily cleared up, and there are several other questions of no small 

 importance which require further research in the field. It is earnestly 

 to be hoped that it will some time be possible to survey in detail those 

 uninhabited districts, which lie beyond the Indian frontier, for then 

 only can we expect to completely unravel a problem, which is no 

 doubt among the most attractive in Indian Geology. 



( 57 ) 



