DESCRIPTION OF SECTIONS. 263 



when the water of the Seista*n lake rose up to the level at which 

 these deposits occur. 



The locality called Rob£t K6h-i-Malik-Si4h is situated on the 

 banks of a river-plain overlooked, on the north 

 by the mountains called Roba*t Koh and Malik- 

 i-Si£h Koh, while to the south rise the two masses of the Lar Kohj 

 the eastern one being usually called the Miri. All these mountains 

 consist to a large extent of tertiary strata, mostly shales interbedded 

 with calcareous sandstones and occasional limestone bands, and over- 

 laid by a considerable thickness of nummulitic limestone. Instead of 

 forming numerous parallel synclinal and anticlinal folds such as occur 

 in the portions of the range so far described, these rocks show much 

 less disturbance, the dips being low and uniform. The manner in 

 which these regularly dipping masses are joined to the more closely 

 folded ones is not seen clearly, much of the geology being concealed 

 by the coarse alluvium of boulders that occupies the broad river 

 valleys. It is probable that the great limestone, on account of its 

 unyielding nature, has moved bodily, the structure being again some- 

 what that of a thrust-plane, as in the instances mentioned near 

 Saindak. The shales immediately underlying the limestones have 

 moved along with them and shared in the same uniformity of struc- 

 ture. Where they lack the. covering of limestone as in the broad 

 valley that separates the Robat Koh mass from that of the Lar Koh, 

 they once more assume their more closely folded character. 



The succession of strata is best seen on the north-eastern slopes 

 of Roba*t Koh (section Fig. 13 and PI. VI). The lowermost strata 

 are very badly exposed tuffs, overlaid by a considerable thickness 

 3,000 ft. or more of green shales and calcareous sandstones, with 

 occasionally a more important limestone band. These shales are in 

 turn overlaid by a considerable mass of thick-bedded limestone. 

 Some of the lowermost shales contain Orbitolites and are probably 

 upper cretaceous. Fossils were found both in the limestone e and in 

 the lower beds of the upper limestone g, belonging in either case 

 to the same species. The joraminifera are especially numerous 

 and varied being represented by several species, some of which 



( 85 ) 



