28 WYNNE : TRANS-INDUS EXTENSION OF THE PUNJAB SALT RANGE. 



3. Thick formation of gypsum, dolomite and shales, some of the gypsum being black 

 and bituminous : only known trans-Indus. 



2. Purple sandstones, cis-Indus and trans-Indus. 



1. Cis-Indus, gypsum beds with lenticular patches of volcanic rock: great beds of 

 rock-salt and kallar (impure salt), red gypseous marl, and thin layers of dolo- 

 mitic rock, also beyond the river at Kalabagh and in the Liin nala adjacent. 



An important point,, however, depends upon the identification of this 

 Age of the boulder P™?le sandstone group (No. 2) trans-Indus. In 

 teds * the Salt Range the next group overlying it to the 



eastward contains some shells of an Obolus or nearly allied form, referred 

 by Drs. Stoliczka, Oldham, and Waagen as a silurian fossil, though the 

 determination of this age for the beds has since been impugned as pre- 

 mature by the latter authority. l The determination of the age of these 

 fossils being thus still somewhat unsettled, if the Obolus shells should 

 ultimately prove silurian, it is possible the group No. 3 above, if not 

 also No. 4, may belong to that period, no devonian rocks being known 

 in this part of India. 



The boulder group No. 4, from the evidence it gives of disturbance 

 and denudation, and its shore-like character, may none the less have a 

 claim to be considered to belong to an entirely newer group than 1, 2, 

 and 3 ; such signs of a break as the boulders afford are usually associated 

 with a lapse of time, which may in this instance have a chronological 

 value of its own. 



Before proceeding to notice with some attention to detail the various 

 localities of the district, I shall conclude this chapter by a condensed 

 sketch of the different groups in their stratigraphical order, with the 

 view of conveying a clearer impression of each than could be comprised 

 within the space of the preceding general table. 



1. The Salt Marl and Gypsum. — Limited to the hills of Kalabagh and 

 the Lun-nala, it is quite similar in character to that of the Salt Range, 

 largely displayed at Mari on the opposite bank of the river Indus. It 

 includes the bright crimson or deep purple gypseous marl as unstratified 



1 Eec. Geol. Surv., Vol. XI, p. 276, 1878. Translation of a paper by Dr. Waagen : Imp. 

 Acad. Sciences, Nat. Science Section, Vienna, 1877. 



( 238 ) 



