STRATIGRAPHICAL ELEMENTS: CRYSTALLINES, ETC. 55 



genuinely altered sedimentary rocks, it may be found in the examples 

 which I shall now give of metamorphosed rocks belonging to the 

 Infra-Trias. 



At several places along the Tanawal country there are examples 

 of a conglomerate shewing all stages of devel- 



Schistose conglomerate. 00 



opment from the normal" Infra-Trias basal 

 conglomerate such as we have seen near Tanakki up to one in which 

 nearly all the constituent pebbles have been deformed, flattened, and 

 dragged out into flakes, whilst the intervening matrix has become a 

 distinctly schistose rock. One of the first stages is to be found near 

 Sobruh Gulee, where the conglomerate has been cleaved and the 

 pebbles turned round in their soft matrix, their long axes being 

 arranged at a considerable angle with their original bedding planes. 

 The pebbles when extracted shew some of the matrix adhering to 

 their ends and are in consequence lens-shaped, whilst what was 

 originally a fine-grained enveloping shale interbedded with and 

 surrounding the pebbles has become a cleaved slate. 



A more advanced form of cleaving with distortion of the pebbles 

 is seen on the road from Chumhud to Nukkeh, and a still more 

 advanced stage north-east of Chountree near Srikot in the Gundgurh 

 range. In the latter the flakes which now represent the original 

 pebbles are so drawn out, flattened, and cut through by parallel 

 shear planes, along which incipient metamorphism has begun, that it 

 is difficult to trace out the original boundaries of the pebbles. 



In certain places, as at the ziarat J mile east of Kurm, the repre- 

 sentative of the purple shales which succeed the 



Metamorphosed pur- » 



pie slate, Infra-Trias. conglomerate has become a sheeny-surfaced 



schistose slate, extremely fissile, the surfaces 



being covered with minute specks or raised blisters (incipient garnets?). 



Still ascending in the Infra-Trias series we may now notice the 



Metamorphosed Infra- limestones and quartzites, which, though quite 

 Trias limestone and recognisable petroWically, and by their strati- 



quartzite. . r & J ' J 



graphical relations to the preceding stages, 

 have become considerably metamorphosed along the length of these 



( 55 ) 



