30 BLANFORD : GEOLOGY OF WESTERN SIM). 



stream of any size running from the west of the range. It is joined 

 from the south, inside the outer range, by the Mogrio and the Trappen. 

 South of these come in succession the Sita (Tooneewaree of map), 

 Mazarani, Sahar, Radha, Biirri, Salari, Klnirbi, and Maki Nais. Next 

 comes the Gaj, which rises west of the Khirthar, nearly under Dharyaro, 

 and, as already noticed, cuts through the range after receiving the 

 drainage of a considerable tract to the westward of the hills, so that it 

 is by far the largest stream flowing from the Khirthar. The only im- 

 portant water-course running from the Khirthar farther south is the Nari 

 Nai, which drains a considerable hill tract, but does not come from beyond 

 the main water-shed, and there is a smaller stream, the Letan Nai,' between 

 the Gaj and the Nari. 



The map employed as a basis for the geological lines is that prepared 

 Topographical map of h Y the Revenue Survey, and, like most maps pro- 

 Sind - duced by the same survey, the object having been 



rather the demarcation of village boundaries than the preparation of 

 a topographical representation of the country, the wilder and more hilly 

 parts of the province, which are of small value and yield but little 

 revenue, have not in general been mapped in detail. Even in the more 

 populous parts of the country, the topography of the map is far from 

 perfect — a circumstance perhaps due, in part, to the practice, in many parts 

 of Sind, of changing both the locality and the name of villages ; but still 

 there are errors not to be thus explained. The mapping of the hills is 

 very unequal. In the neighbourhood of Karachi and of the Habb valley, 

 the map is good and correct, and the hills are properly laid down. 

 The same is the case throughout part of Kohistan. The Khirthar range 

 is less well mapped; the general lines are shown, and many of the 

 ridges properly represented, but neither the streams nor the hills are 

 accurate in detail. The worst part of the map is that representing the 

 Laki ranges and the low hills near Manjhand and Kotri. These are all 

 very imperfectly represented. 



In the geological map nothing like minute detail has been attempted, 

 and, with a few exceptions, the reduction herewith published on the 

 ( 30 ) 



