SHEKH BUDiN HILLS. 77 



the cliffs where the section was well exposed, but inaccessible for the 

 most part, they have the following arrangement : — 



Shaly limestone 



Drab shale 50 feet 



Gray shales with limestone bands . . . „ 



Black alum shales 100 feet . 



Crimson clay or bole ...... 



Shaly limestone with numerous fossils , 



Above this shaly zone comes the mass of thin-bedded pale or dun- 

 coloured limestone with some intercalated clays or shales which forms the 

 sheer cliffs along these bluffs, and bends round the end of the southern 

 anticlinal. 



In these limestone beds which may have a total thickness approach- 

 ing to 800 or 1,000 feet, there are numerous fossils — Crinoids, Corals, 

 Chemnitzia or Cerithium? Echinus spines, ILhynclionella, Terebratulce, 

 some Pectens, Goniomya, Ammonites, and several others besides one of 

 the Asteridea, an imperfect impression of which I was unable to remove 

 from the surface of the limestone bed that exposed it. 



The absence of Trigonice in these fossiliferous beds appeared peculiar. 



The Jurassic beds so far present two strongly marked groups, a varie- 

 gated sandy and earthy one of great thickness 

 Two groups. tit 



below, succeeded by a calcareous one above of 



uniform dun or light-yellowish colour. The separation, it will be seen, 

 was already somewhat defined in the Chichali range (page 45), but here 

 it is much more complete ; the limestone layers in the lower group, while 

 they serve to connect both, are insufficient to affect the striking difference 

 of character between these two parts of the formation. 1 



1 Dr. Waagen has shown the palseontological correspondence between the Jurassic beds 

 of the Salt Range and those of Each (Geol. Surv. Manual, p. 496). A stratigraphical 

 difference, however, which has been also observed in this formation in the intervening deserts 

 (Records, X, pp. 18-19), exists in the fact that in Kach the arenaceous portion of the whole 

 group overlies the limestones, while here and in the Indian desert the reverse is the case 

 (cf. Manual, pp. 253, 263, and 495). The Itanikot group of Sind as described (Manual, 

 p. 451) appears to be strikingly similar in composition to the variegated Jurassic beds here. 



( 287 ) 



