1853.] Report on the Geological Structure of the Salt Range. 259 



arenaceous shales. They are most indistinct and are probably the 

 remains of Fucoids. 



The rocks we have described under the term Devonian, form in 

 thickness and extent, perhaps the most striking feature in the geo- 

 logy of the Salt Eange, appearing in its steep escarpment subordinate 

 to all the rocks hereafter to be noticed, and in the numerous ravines 

 which intersect it. 



On proceeding westward from Ehotas, they first emerge from 

 under the. miocene sandstones on the East flank of mount Tillah, the 

 great mass of which they form, all the subdivisions of the series 

 being duly represented in this mountain (see section No. 4) with 

 the exception of the copper shales. From its West end they may be 

 traced across the Poonah Nullah into the Chumbul Eange, where 

 they are flanked to the East by the miocene sandstones of the Imapore 

 hills. On the Gurjah hill above Jelalpore, they are extensively 

 exposed, and form the mass of the Eange on to Baghanwalla, where 

 the upper red sandstones attain their greatest thickness. From this 

 point they stretch North for several miles, dipping under the table- 

 land of Besharut and rising up again to form the summit and scarped 

 northern face of mouDt Kuringali and Drengum, from where they 

 may be traced into Diljubba, where they are for the most part con- 

 cealed by the extensive Tertiary strata which stretch East to Buk- 

 nala. 



From Baghanwalla westward the Devonian rocks can be traced 

 uninterruptedly. Around Kuttha the copper shales first appear, 

 and seem in a great degree to take the place of the upper dark red 

 sandstones, which can scarcely be recognized between that locality 

 and Moosakhail, except in the neighbourhood of Chideru, where 

 thick beds of them occur subordinate to the shales. From Moosa- 

 khail on to the Indus, the Devonian formations above the salt marl 

 seem to amalgamate, and the divisions which are so distinctly marked 

 in the East part of the Eange can with difficulty be made out, the 

 thickness of the whole gradually diminishing. They disappear alto- 

 gether around Maree and Kalibagh. 



In the Chichalee Eange of hills on the West bank of the Indus 

 below Kalibagh no Devonian rocks crop out, but at the North or up- 



