KHIRTHAR RANGE. 93 



Brought forward ... 731 



23. Light-brown, calcareous grit and sandstone passing into impure 



gritty limestone, very distinctly but obliquely laminated, and con- 

 taining rolled fragments of a ferruginous and argillaceous rock- 

 like laterite. This is apparently the principal echinoderm bed 30 



24. Sandy shales with thin bands of brown argillaceous limestone, con- 



sisting of a ferruginous clay cemented by carbonate of lime. 

 These bands contain spines of echinoderms and fragments of 

 mollusca 150 



25. Fine dark-bluish and greenish-grey shales, nodular in places, 



with an efflorescence of feathery crystals (? sulphate of alumina) 

 where exposed and cracked 50 



26. Interstratifications of similar shales to the last, with bands from 



a few inches to 2 feet thick of coarse, brown limestone con- 

 taining spines of echinoderms 10 



27. Shales like No. 25 50 



28. Fine greenish-grey shaly sandstone, with minute spangles of mica ; 



lower portion not seen 50 



N. B. — In this lower portion, and not exposed in this section, is one 

 of the most characteristic beds of the group. It is a white lime- 

 stone, hard and nodular, usually abounding in Foraminifera, and 

 containing corals in considerable numbers, some of them very 

 large. This bed is well seen in the bed of the river about a mile 

 lower down. 



29. Coarse, brown limestone, gritty, very hard, and obliquely laminated, 



containing small ferruginous and argillaceous concretions, and 

 abounding in spines of echinoderms. The thickness of this 



bed on the Gaj varies from 20 to 50 feet 35 



N. B. — This is the bed near the base of the Gaj group, which 

 forms a conspicuous scarp throughout the Khirthar range, and 

 aids so much in enabling the lower boundary of the group to be 

 recognized and mapped. It forms. the peaks of Amru, Hashim, 

 Chatia, Lali, and several other conspicuous hills, and angular 

 fragments of it are scattered over the country near its outcrop. 



30. Olive clays varying in tint, some paler, some darker, with a few 



hard calcareous bands a foot or more in thickness, and more 

 numerous above than below. In the clays Corbula trigonalis, 

 Twrritella angulata, and a small oyster, a Nueula, and other 

 fossils occur 120 



31. From the last bed to the base of the group similar clays, with one 



or two hard calcareous bands, occur. These beds are only seen 

 some distance up the river, above the outcrop of the Nari beds . 130 



1,356 



( 93 ) 



