]G2 BLANFOED : GEOLOGY OF WESTERN SLND. 



in again to the westward. At Mai Mohari, the southern extremity of 

 the Kara range, dull muddy limestones, containing Nummulites garan- 

 sensis and N. sublcevigata, pass downwards apparently into a coral bed, 

 which contains tubes of Kupkus, and is inseparable from the Khirthar 

 croup ; whilst above the N. garansensis bed there is a gritty sandstone 

 with large Orlitoides (0. papyraced). Here again, as near Trak, there 

 appears a greater distinction between the Orlitoides bed and that con- 

 taining the two Nari Nummulites, than between the latter and the 

 Khirthar limestone. 



The great belt of Nari beds which intervenes between the Khirthar 

 area of Kohistan and the Gaj tract north-west of 

 Karachi, terminates to the southward near Jung- 

 shahi, being there covered over partly by alluvium, but chiefly by later 

 tertiary formations. There are some anomalies here in the sequence. 

 The Nari beds are evidently very much thinner to the eastward than 

 they are to the westward, and not only their upper sandstones dis- 

 appear, but some of their lower beds ; and the Orlitoides sandstone rests 

 unconformably, to the north of Jungshahi, upon the Khirthar group, 



without the intervention of the limestone with 



Break in Nari beds. ^ . , _ r 7J . mi 



Nummulites garansensis and iv. subimngata. ine 



surface of the Khirthar limestone appears in places to have been 

 worn and denuded before the sandstone of the Nari group was deposited. 

 There appear therefore here to be stronger reasons than elsewhere for 

 inferring a break in the middle of the Nari beds rather than at their base. 

 The break is doubtless local, and is one additional instance of the irreg- 

 ular deposition of the Indian tertiary rocks, and of the difficulty of 

 classifying them. Precisely similar local breaks have been noted in the 

 Punjab, and there, as in Sind, it has been found that a classification of the 

 beds, which accords with the facts observed in one portion of the province, 

 by no means agrees with the arrangement of strata exposed in another 

 district. 



The Khirthar beds east of Jungshahi are, as described in the last chap- 

 ter, much broken up into rubbly and shaly beds, and interstratified 

 ( 162 ) 



