VREDENBURG ! SKETCH OF BALUCHISTAN DESERT. 



of the most massive and therefore unyielding rocks, such as some of 

 the agglomerates or some of the more massive limestones, that this 

 cleavage is less distinctly marked. In the region of Bogor, near the 

 Kacha K6h, the strike of the cleavage planes presents this particu- 

 larity that it is more northerly than the strike of the bedding. 



The mountain called Kacha Koh is an anticline of dark coloured 

 tuffs. 



Along the north-eastern margin of the ranges where they overlook 

 the Gaud-i-Zirreh depression there are several exposures of Siwaliks 

 dipping inwards towards the ranges. In one place, north-west 

 of Kirtaka, their junction with the older tuffs is exposed. It is a 

 thrust-plane marked by a very much broken up limestone, the 

 adjoining Siwalik clays being also very much crushed and broken. 

 It is probable that the Siwaliks are continuous all along the north- 

 east margin of the ranges, but that they are only occasionally exposed 

 on account of their being concealed beneath the great talus that 

 skirts the ranges. The great talus is furrowed by innumerable 

 parallel ravines very much after the manner of the one described 

 north of Nushki (page 9). They constitute such a serious obstacle 

 to travelling that from Kirtaka the caravans cross the Persian boun- 

 dary and proceed through Persian territory from Said Langar to 

 Piran Ziarat along valleys in which the wild pistacio-tree grows 

 somewhat abundantly. 



At Piran Zia*rat we find again an outcrop of those puzzling shales 

 and calcareous sandstones already so often met with in the continua- 

 tion of the Kojak range east of Nushki (page 40), at Mirui (page 61) 

 and again in the Saindak section (page 80). But here their evi- 

 dent connection with the Ranikot strata of the Lar Koh makes it 

 quite clear that they too belong to that same age. 



All along the north-east margin of the ranges from the Piran 



river up to K6h-i-Malik-Sidh, the Siwalik strata are well exposed. 



At Kirtaka, along the foot of the hills that overlook the Gaud-i- 



TerracesoftheSeistan Zirreh depression, there are some terraces of 



lake - fine silt which were probably formed at the time 



( 84 ) 



