224 VREDENDURG* SKETCH OF BALUCHISTAN DESERT. 



direction the section ascends ; it more probably ascends when travelled 

 across from west to east as in the case of the section described 

 north of Nushki (page 42). The westernmost and probably lower- 

 most rocks are calcareous shales whose deep brilliant hues, red and 

 green, are probably due to the admixture of volcanic material ; they 

 are associated with conglomeratic and pebbly bands in which the 

 fragments consist of volcanic materials but which exhibit a distinctly 

 waterworn appearance. Continuing eastwards, the same rocks 

 become interbedded with limestones some of which are arenaceous ; 

 they contain a few shattered fossils mostly species of C erithium that 

 appear identical with others met with elsewhere together with Rani- 

 kot fossils. Other instances will be noticed where these con- 

 glomerates are found associated with beds containing a Ranikot 

 fauna (page 58). Further east is a thicker bedded limestone rising 

 to form a ridge in which a violent anticlinal flexure can be recognised. 

 Beyond it come some more variegated shales and then tall crags of 

 nummulitic limestone. This forms the culminating point of the ridge ; 

 on the eastern slopes, we meet with more variegated shales, and 

 again nummulitic limestone, the conditions being too much disturbed 

 to decide whether it is a repetition or not of the first one. Lastly, 

 a broad plain extends to the foot of the Siwalik hills that border the 

 great Nushki range. 



In a S. by W. direction, these ranges rapidly increase in height, 

 reaching an altitude of 5,825 ft. to the east of 



Tafui section. . 



" Jaurakin. I did not examine this portion of 

 the range, but a little further, in the neighbourhood of "Tafui 

 11111," it still consists of tertiary shales and limestones. The total 

 width of the range increases as well as its height, and beyond Tafui 

 another kind of rock sets in, in addition to those already mentioned: 

 these are tuffs similar to those that were first mentioned in the sec- 

 tion north of Nushki ; they skirt the north-western edge of the range 

 forming black ridges which gradually increase in height; seen from 

 the plain on the north side they present the appearance of a great 

 black wall which conceals all the tertiary ridges to the south-east. 

 ( 46 ) 



