16-2 WYNNE : GEOLOGY OP THE SALT RANGE IN THE PLTSTJAB, 



chiefly consists of fine grey, gritty, light-coloured sandstones, and the 

 more compact dolomitic rock is not so prevalent as it is upon the outlying 

 hills to the southward. The group is about 250 feet in thickness. Over 

 it comes the red salt-crystal zone, in places as thin as 30 feet, but still 

 so strongly ochreous that the rain washes the iron oxide out and stains 

 the rocks below. 



The olive conglomeratic shale with metamorphic pebbles belonging 

 to the " olive group " overlies this red zone, and in the same group 

 are included many massive soft sandstones, the whole exceeding 150 

 feet in thickness. These beds and the red group lie chiefly behind 

 or on the plateau side of the general escarpment. Near the head of the 

 ravine a narrow vertical mass of nummulitic limestone is brought in by 

 a north-east south-west fault, together with some soft black and grey 

 gypseous shales having an apparent thickness of about fifty feet. 

 These overlie the ^' olive group," conglomerates, &c., and come just beneath 

 the limestone. Further northwards, undulating, inclined, and disturbed 

 masses of the nummulitic limestone rest upon this olive group and the 



intervening shales (which, again, contain layers of 

 Coal. , . , . 



coal m their outcrop), extending from this valley 



to the neighbourhood of Pid. At a distance of about half a mile south- 

 wards from the latter village, some mining operations have been carried 

 out upon the coal, beneath a displaced mass of the limestone. 



The coal-shales here dip with the limestone at 40° to the northward, 

 and rest upon soft friable whitish sandstone — some of the basal beds of 

 the nummulitic series. The section measured as follows : — 



7. Nummulitic limestone, part .. . 



6. Rotten, white, and grey shale 



5. Coal ... ... ... ... ... 3 ft 



4. Dark -coloured shale ... ... 



3. Coal 



2. Black shale 



1, White earthy sandstone, full of plant-fragments. 



162 ) 



Ft. 



In. 



. 100 







. 10 







. to 3 



9 







11 



1 



2 



.. 23 







