92 WYNNE : TRANS-INDUS EXTENSION OE THE PUNJAB SALT RANGE. 



anciently existing elevated regions lying between India and the rest of 

 the Asiatic continent. 



Looking further back, it will be seen that laterally changing sections 

 (changing more by reason of the presence of groups elsewhere absent and 

 the converse of this arrangement, than by gradual internal changes of 

 the groups themselves) is a feature characteristic of the whole Salt Range 

 region and its trans-Indus extension. But the observation may be ex- 

 tended even beyond these limits, for the frontier sections next known to 

 the southwards, although comprising geological representatives of part of 

 the general series here, differ quite as much as they resemble those of this 

 country in the character of the groups displayed. 1 Further still, to the 

 southward, in Sind, the sections, 2 embracing only mesozoic and eocene 

 representatives, are even more unlike those of this country than the in- 

 termediate ones j for marine tertiary groups, entirely unknown in this 

 part of the Punjab, form a considerable portion of the Sind series. 



When such differences as occur in the development of the Punjab 

 sections can have taken place within the limits of this province, it 

 follows that close identity with greatly more distant areas should not 

 be anticipated ; particularly when all the regions capable of comparison 

 are situated along the margin of an extended continental region of 

 disturbances, some of which may have originated at very early periods. 



ECONOMIC RESOURCES. 



The valuable mineral productions of this region are almost exclusively 

 limited to the salt of Kalabagh and the Ltin nala, the alum of Kala- 

 bao«h and Chichali pass, the coal or lignite collected in small quan- 

 tities at times from the Jurassic beds of the Kalabagh hills, and the gold 

 washed from the Indus gravel. 



The salt and its sources have already been described in the Salt 

 Range Memoir (Mem. Geol. Surv. India, Vol. XIV, page 274) and in the 



1 Ball, on the country of the Luni Pathans : Records Geol. Surv. India, Vol. VII, 



p. 145. 



2 Blanford, Geology of Sind : Records, Vol. IX, p. 8 : Manual Vol. II, chap. XIX, and 

 Part 1 of the present Vol. of the Memoirs. 



( 302 ) 



