THE PATLI DtJN. 7t 



and no sharp break can be detected between them and the slates with 

 which they have become welded as it were by a sustained pressure. 

 That such a break must exist I have shewn in my previously quoted 

 paper, by reference to a portion of the country further north-west, 

 where the differences of metamorphism are more conspicuous. In 

 detailing the section to follow, I shall again put forward a weight of 

 argument, which must disprove what would otherwise be a somewhat 

 fascinating, and on the surface of things plausible, theory, that the 

 schistose series were, as their position seems to indicate, of really 

 younger age than the nummulitics, above which they might be con- 

 sidered to lie in a great synclinal. 



At the main boundary fault the bed of the Pelcini divides into two 

 channels, and it is in the western of these that a junction section is 

 exposed. The Nahan sandstone, fairly hardened, is seen to dip 

 apparently N.N.E. at about 6o° ; and above it, with merely a few 

 inches of grey calcareous mudstone intervening, comes the massive 

 limestone dipping also in the same direction, and with the same 

 amount as the inverted Nahans. There is no crushing or disturb- 

 ance of the rocks visible, though the hidden ground on both sides 

 may contain examples of such crushing. No one, from the composed 

 appearance of the rocks, would dream that there was a fault, much 

 less a reversed fault or thrust-plane, along that plane of junction. 

 And yet, looking forward along the section, we see, by reason of the 

 appearance of mesozoic and nummulitic strata normally above the 

 limestone, that the main boundary cannot be an inverted plane of 

 natural deposition, even approximately. We see absolutely that 

 immense faulting must have supervened. 



For about a quarter of a mile north of the main boundary, the 

 exposures of the massive limestone in the river section are not good. 

 The banks are hidden by stalactites of calcareous tufa in dripping, 

 mossy cliffs. There is next a short distance of massive limestone, and 

 a few grey slates, dipping from 8o° to 6o°N.E. ; and then a purer band 

 of the limestone. This rock is of the same nature as those repeatedly 

 mentioned in my previous papers on the Himalaya, that is to say, it 



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