24S VREDENBURG: SKETCH OF BALCCHISTAN DESERT. 



gentle undulations without any leading direction of strike. South 

 of the Malik Naro intrusion, dips were observed 30°E. of S., at Butak 

 itself 25 E. of N. and 40 E. of N. In the latter case the rocks are 

 tilted at a high angle, but not otherwise crushed or disturbed. 



East of Butak and north of Jhuli, horizontal terraces of sub-recent 

 travertine are spread over the slopes of the hills formed by the 

 gently dipping flysch strata. They will be mentioned again in 

 connection with the recent volcanoes. 



These calcareous terraces rest partly upon the flysch strata, and 

 partly upon an intrusion of granophyre (spec. ■^ T ) i of similar 

 composition to the coarser-grained micropegmatitic diorites of Malik 

 Naro and Pushtiwan, but less perfectly crystalline, no doubt owing 

 to the smaller size of the intrusion. At its junction with the strati- 

 fied rock it assumes quite the appearance of an eurite. 



West of the Malik Naro and of Butak there is a sudden drop in 

 .. ., the altitude of the mountains. From there up to 



Manzil. r 



the great mass of K6h-i-Sulta*n, the hills are low 

 and scattered at intervals, leaving a broad gap through which the 

 north wind sweeps with furious violence during the greatest part of 

 the year, burying everything beneath an ocean of sand dunes. At 

 Butak itself the wind is so violent that the surface of the rocks is 

 everywhere sculptured in the most curious manner by the sand grains 

 borne by the hurricane, while further west, all about Manzil, the 

 small rocky hills are half buried beneath the accumulated sand. 

 These hills cause the wind to form eddies and all the valleys, what- 

 ever their shape and orientation, are gradually becoming choked 

 with sand. 



The rock, wherever it appears, consists of the same volcanic 

 rocks of the flysch period. There is a good exposure at Manzil 

 where the irregularity of structure is again exemplified by the direc- 

 tion of dip 30 W. of N., quite different from the orientation at 

 Butak, 



East of Manzil is a large igneous intrusion forming the hill called 

 Manzilgarh ; it consists of fine-grained biotite-granite (spec, -g- 1 ^, 

 ^ 3 3 ). It is traversed by narrow dykes of basalt (spec, -g^-). 

 ( 7o ) 



