138 BLANFOB.D : GEOLOGY OP WESTERN SIND. 



alum shales of a dark colour containing iron -pyrites and decomposing 

 readily on exposure, and also some bright yellow layers of ochrey clay. 

 Near the Girran pass these beds dip west at high angles ; 45° to 50.° 

 The rocks are much disturbed and contorted, and 

 the Khirthar beds overlying the Ranikot are verti- 

 cal, or in places have even a reversed dip for a short distance. The 

 inclination, however, soon becomes less. 



Between 3 and 4 miles south of the Girran pass there is ano- 

 ther pathway across the hills called the Hothian 

 pass. The scarp of Khirthar limestone west of 

 the Ranikot anticlinal, it should be mentioned, is continuous through- 

 out the range from Jakhmari to Hothian, except where cut through 

 by the Mohan river at Ranikot. At Hothian, on the face of this 

 scarp, the Khirthar limestone is distinctly seen to be unconformable 

 to the underlying Ranikot beds, the latter dipping at a rather higher 

 angle, and having evidently been denuded before the Khirthar limestone 

 was deposited. The denudation, however, appears of no great amoant, 

 only the uppermost Ranikot beds having disappeared. The chief im- 

 portance of this local unconformity, which appears to be persistent 

 throughout the Laki range, but wanting a few miles away to the south- 

 east, is to show that the boundary between Khirthar and Ranikot beds 

 should be drawn at the base of the white limestone, and that the fossili- 

 ferous brown limestones of Lynyan and Jhirak belong to the older sub- 

 division. 



The great Ranikot inlier of the Laki range terminates close to 

 Hothian pass ; no beds of older date than Khirthar have been discovered 

 to the southward in the range. Before describing the southern portion 

 of these hills, a few remarks are necessary on the western branch, extend- 

 ing along the eastern side of the valley between Chorlo and Pokran, 

 and including the Daphro range. 



The head of the Mohan stream is nearly west of Bor Hill, and the 

 ridge west of the stream is one of the usual 

 secondary anticlinals of Khirthar limestone. West 

 ( 138 ) 



