254 



MK. W. T. BLAKFOED ON THE OCCFEEENCE OF 



similarity of the boulder-formation in the Salt Eange, and he 

 obtained from it a roughly rounded fragment of red granite*, 

 polished and striated on three sides, the direction of the striation 

 being different in each case. This boulder is now in Calcutta. 



The bed just mentioned has hitherto been considered part of the 

 " Olive Group " of Wynne, and classed as Cretaceous. The relations 

 of the beds may be illustrated by the accompanying section, copied 

 from Mr. Wynne's sketch of Karangli Hill f, the locality from which 

 Mr. Theobald obtained the boulder just mentioned. 



Section through Kardngli Hill. [Erom the ' Memoirs of the 

 .Geological Survey of India,' vol. xiv. pi. xv. fig. 19.] 



Karangli Hill, 

 3528 ft. 



1. Salt Marl; 2. Purple sandstone; 3. Dark shales with Obolus; 4. Mag- 

 nesian Sandstone ; 5. Olive Group ; 6. Nummulitic Limestone ; 7. Tertiary 

 Sandstone. 



JSTummulitic Limestone occurs at the top, resting upon the Olive 

 Group, the uppermost portion of which is fossiliferous, and contains 

 locally, amongst other fossils, Cardita Beaumonti, a characteristic 

 fossil, in Sind+, of a stage that is certainly older than any recog- 

 nized Tertiary horizon, and must probably be classed as very high 

 Cretaceous. Beneath this fossiliferous band there is a considerable 

 thickness of sandstone, containing no fossils except some ill-marked 

 bivalves, and then comes the boulder-bed. The Cardita-Beaumonti 

 beds, Olive sandstone, and boulder-bed form the " Olive Group " of 

 Mr. Wynne. 



Beneath the boulder-bed there is, in places, a band of thin-bedded 

 sandstones and bright red clays, known as the Pseudomorphic Salt- 

 Crystal Zone, on account of the pseudomorphs of cubical salt-crystals 

 found on the surface of the sandstone. This bed is unfossiliferous 

 and maybe neglected. The next in descending order, the "Magne- 

 sian Sandstone," is equally unfossiliferous, but it is much more im- 

 portant. It is unquestionably Palaeozoic ; for, further to the west- 

 ward, it passes beneath another unfossiliferous bed, the " Speckled 

 Sandstone," which there underlies the Carboniferous Productus-lime- 

 stone. Both Speckled Sandstone and Carboniferous Limestone, it 

 must be understood, thin out to the eastward §. Thus it is mani- 



* Eec. G. S. I. 1877, p. 224. 



t Mem. G. S. I. vol. xiv. pi. xv. 



I Mem. G. S. I. vol. xvii. p. 34 ; also Pal. Ind. ser. xiv. pt. 2, p. 16, pt. 3, p. 7. 



§ See the diagram given by Mr. Wynne, I. c, opposite p. 69. 



