STRATIGRAPHICAL ELEMENTS: INFRA-TRIAS. 23 



In Iithological appearance this rock has been noticed by Wynne 

 and Waagen as very much resembling the 

 with the Speckled Purple Sandstone (L. Cambrian at least) of the 

 R a a n n d e 0ne ° f the Sak " Salt-Range. If, however, our correlation of 

 the conglomerate with the Carboniferous 

 Boulder-bed be correct, these sandstones cannot be equivalents of the 

 Purple Sandstone ; but on the other hand they may very possibly 

 represent the Speckled Sandstone, which in the Salt Range follows 

 next above the Boulder-bed. 



(3) The upper limestones. 

 At some places in the Sirban neighbourhood the sandstones just 

 described pass gradually both by alternation and 



Passage of the sand- .... 



stones into the lime- by change of material into the upper limestones 

 which form the top member of the Infra-Trias 

 series. The lowest member of the limestones is a deep purple very 

 sandy limestone. After some interbeddings of 

 sandstones and calcareous sandstones with 

 purple limestones, the latter become less and less sandy, and at the 

 same time change their colour to fainter tints of purple and pink. 

 There are local variations in the amount of the colouring matter in 

 the limestones, but generally as we rise into higher beds the colour 

 pales, until it becomes of a white or cream colour. As far as I have 

 seen, none of the limestones of this series are dark grey in colour 01 

 mottled as in the Trias series above ; the colours are always purple, 

 flesh-red, pink, white, or cream. There is, therefore, very little diffi- 

 culty in distinguishing the one from the other in the field. 



In structure the rock is generally extremely compact and well- 

 bedded, more so than any of the other lime- 

 Structure. 



stones that we shall have to deal with later. In 



the view of Sirban hill from the north (Plate 6) the well-bedded layers 

 of rock dipping down the hill-slope to the right of the sketch are 

 Infra-Trias limestone ; as also are the marked scarps in the middle 

 of the picture where the bedding is depicted with firm lines. In 



( 23 ) 



