100 BLANFORD : GEOLOGY OP WESTERN SINK. 



aries of the group than in the intervening space. The outcrop is in places 

 Nari and Gai beds upwards of 5 miles broad. The breadth of the 

 south of Gaj nver. Naxi outcrop, on the other hand, is much con- 



tracted. Further south, on the Nari Nai, the low dips of the Gaj group 

 are replaced by an abrupt anticlinal, the Gaj beds have been denuded to 

 the westward, and are only represented by a narrow outcrop, seldom 

 exceeding half a mile in breadth, whilst the Nari area expands to 



a breadth of between 6 and 7 miles. The 

 Kukadani range. 



continuation of the anticlinal to the southward 



forms the Kukadani ridge, at first entirely composed of Nari beds, 



but further south the Khirthars crop out, and at the head of the 



Nari valley the Kukadani and main Khirthar range unite in a rather 



high peak known as Ghurru. Thus the whole upper plain of the Nari 



stream consists of Nari beds, with the exception of one small inlier 



of Khirthar limestone brought up by a fault south of Karo Kot. 



North-west of Karo Kot the Nari beds at the base of the Khirthar 



Nari beds in Nari range are greatly crushed and contorted, and the 



va y> boundaries are most irregular, but throughout the 



upper part of the Nari valley the Khirthar range appears to be a great 



roll of nummulitic limestone, and the Nari beds come in at moderate 



angles of 5° to 1 0° at the base of the hills. The limestones at the base 



of the Nari beds are unusually well developed. South-west of Karo Kot 



they are at least from 200 to 300 feet thick, or much more than on the 



Gaj, and the whole of this thickness appears composed of limestone, 



mostly of a brown colour, with Orbitoides jaapymcea, &c, the shales 



usually found associated not being seen towards the base. 



The water in the Nari Nai comes from a hot-spring (temperature 



91° Fahr.) which rises in the bed of the stream 

 Hot-spring. 



about one and a half miles south of Karo Kot. 



A fair section of Gaj and Manchhar beds is seen in the Nari Nai ; 



both groups dip at a high angle. The coral bed 

 Section on Nari Nai. 



of the former is well exposed, and one band of 



limestone near the base of the group abounds in Bryozoa. 



( 100 ) 



