SOUTH-WESTERN PORTION OF KARACHI COLLECTORATE. 173 



extending along the western side of the Kambu - range, already noticed 

 at the commencement of the present chapter. The anticlinal in ques- 

 tion appears to be a faint continuation to the southward of the Khirthar 

 axis, and has high dips on both sides, especially on the western. The 

 western border of the larger Gaj area just mentioned is turned up 

 and dips eastward at a considerable angle, being marked by a ridge 

 escarped to the westward, and extending for many miles from north 

 to south. The Gaj beds appear in the bed of the Baran river at Pir 

 Gaibi, south-west of Karchat. They consist largely of argillaceous lime- 

 stone, as in the area near Karachi, and are much less shaly than they are 

 to the northward. 



East of the Gaj outlier, and opposite the southern extremity of the 

 Khirthar range, the Nari beds, including both the marine beds at the 

 base and the soft sandstones forming the upper part of the group, are 

 well exposed in the Baran river. In the sandstones, impressions of plants 

 were found. 



In the Nari belt between the Gaj tract west of the Kambu range and 

 Beynir Hill north-east ^ ne mam area t° * ne westward, Khirthar rocks 

 of Bahuja. appear in one spot, at Beynir Hill, which lies about 



7 miles north-east of Bahuja-ka-dat, and 10 miles east-by-north from 

 Thana Shah Beg. Even here there is some doubt whether the lowest 

 strata seen are the bottom beds of the Nari group or the upper layers 

 of the Khirthar. Calcareous sandstones and arenaceous limestones, with 

 large and small Orbitoides (0. papyracea) in abundance, cover the greater 

 portion of the rise, but below is a very tough speckled limestone, some- 

 what arenaceous and containing casts of very small Nummulites, the 

 species not determined. This is the lowest bed seen. 



Returning northwards towards Tong, along the edge of the ' Mol 

 plateau of Gaj beds, the north and south line of 



Line of dislocation. . ... 



anticlinal curvature, forming the axis to which the 



Nari inlier near Rahtfja is due, leaves the Gaj plateau nearly south of the 



Dumbar range, and about 12 miles south-by-west from Tong. Thence 



the line of dislocation, here becoming a fault, extends northwards towards 



Baili, where its effect will be noticed presently. About 2 or 3 miles 



( 173 ) 



