66 MIDDLEMISS: GEOLOGY OF HAZARA AND BLACK MOUNTAIN. 



by pressure with differential movement, that the ends of the one 

 overlap the ends of the next to it. A bridge between two grains is 

 thus formed, and we have lenticles connected by a narrow band of 

 broken-up and re-cemented quartz and felspar powder. This particular 

 and common type of structure is figured by me, Rec. G. S. of I., Vol. 

 XX, PI. I, fig. 3, and Vol. XXI, PI. II, fig. 10, PI. Ill, figs, n and 12. 

 Three or four miles north of Mansehruh, where the rock is less 

 markedly porphyritic, we have abundant examples of this structure. 

 In the Shal N., Black Mountain, it is, however, seen to the 

 greatest perfection (see on p. 72 for microscopical section of this rock). 

 A. (1) is seen near Kand, Black Mountain. It represents the extreme 

 of dynamical action on the gneissose-granite. The lenticles no longer 

 remakt either isolated as in the augen, nor united by a bridge as in 

 the lenticular-tabular, but are now drawn out perfectly flat and 

 tabular. 



All the above foliation effects included under the headings A and 

 B are more marked in the thinner bands of the gneissose granite 

 (except in the case of the irregular ramifying apophyses) and at the 

 margins of the thicker ones, than elsewhere. 



From observations made by me near Mansehruh, Gurhee-Hubeeb- 

 ooluh, in the neighbourhood of Lalo Gulee, in 



thffSd ° f thS r ° Ck ^ the Black M 0111 ^ 11 ; and from a few cursory 

 notes made in Agror whilst travelling rapidly, I 

 find that the relation between the gneissose-granite and the enclosing 

 schists is of precisely the same kind as I have found to be the case 

 in the Lower Himalaya. 



In making an isolated traverse across any portion of the country 

 in which these rocks occur it would be very easy to go away with 

 the impression that the two were mutually interbedded and of the 

 nature of schists and gneisses. The foliation of the two rocks would 

 seem to be perfectly parallel, and one might never come across any 

 of those interesting exceptions which shew their unity to be only 

 apparent and not real. Hence the conclusion come to by Mr. Wynne 

 and referred to above (p. 49) is a very natural one at a certain 

 stage of enquiry. It is only when the individual bands of the 

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