50 BLANFORD : GEOLOGY OF WESTERN SIND. 



always diminish in abundance and thickness above, although they are 

 occasionally found as much as 1,500 feet above the top of the Khirthar. 

 The shales and fine sandstones, with occasional bands of limestone, consti- 

 tute the lower Nari beds, and pass gradually into the coarser, massive, 

 thick -bedded sandstones forming the greater portion of the group, and 

 attaining a thickness of 4,000 or 5,000 feet on the flanks of the Khirthar 

 range. With the sandstones a few bands of clay, shale, or ironstone, 

 are interstratified, and bands of conglomerate occasionally occur. The 

 Nari beds in their typical form extend throughout the eastern flank 

 of the Khirthar range, and occupy a belt of varying width, from one or 

 two to as much as 10 miles in breadth, between the underlying Khirthar 

 and the overlying Gaj beds. 



On the western side of the Bhagothoro hill, 4 or 5 miles south 

 Break in Nari beds °^ Sehwan, there is a break in the Nari beds, 

 aear Sehwan. an( j some variegated shales, clays, and sand- 



stones, richly tinted in parts with brown and red, and representing 

 the massive sandstones of the upper Nari group, rest unconformably 

 on the denuded edges of the lower Nari brown limestones and shales. 

 The break is evidently local. In the neighbourhood of Jungshahi, 

 50 miles east of Karachi, and for some distance to the northward, also, 



there appears a well-marked distinction between 

 Break near Jungshahi. 



the upper members of the group, comprising a 



yellow calcareous sandstone with Orbitoides papyracea, and the lower Nari 

 limestones with Nummulites garansensis and N. sublavigata, and a few 

 miles north of Jungshahi the former overlap the latter and rest upon the 

 Khirthar limestone. To the east of the Laid range the Nari beds are entirely 

 Nari beds wanting wanting, and it appears very possible that they have 

 east of Laki range. never been deposited in this portion of the Indus 



valley. From the neighbourhood of Sehwan to Jhirak, Manchhar beds 

 rest, with more or less unconformity, on the Khirthar, a very faint and 

 imperfect representative of the Gaj group occasionally intervening. But 

 west of the Laki range, throughout Lower Sind, the Nari beds are found 

 exposed almost wherever the base of the Gaj group is seen ; they increase 

 ( 50 ) 



