24 WYNNE : TRANS-INDUS EXTENSION OP THE PUNJAB SALT RANGE. 



The eocene limestone, absent just at Kalabagh, soon re-appears to the 



north, and becoming disentangled from the local 

 The eocene limestone. . .__ " . . .. . 



displacements, increases rapidly in bulk as it 

 stretches along the escarpment bordering the Isa Khel plain. It assumes 

 a thickness of about 1,500 feet in the Maidan range, and disappears, 

 buried beneath the newer tertiary rocks, as the anticlinal axis of that 

 range stoops downwards near Mitha, being only seen again in one small 

 exposure west of Isa Khel, and entirely absent in the Khasor and Marwat 

 sections. 



The lower tertiary sandstones, inseparably transitional with the up- 

 The lower tertiary sand- permost eocene limestones, which may or may 

 stones - not be on nearly the same horizon as much of 



the trans-Indus and Salt Range nummulitic limestone, are but feebly 

 represented in this country. The same red band, chiefly of clays, which 

 borders the northern flanks of the Salt Range, seems to recur in the Lun 

 nala, and further west, north of the Chichali pass, also on the west side 

 of the Maidan range, but here it dwindles away to a mere streak of a 

 few red clay beds in the base of the next succeeding mass of thick gray 

 sandstones (Dangot beds) . The latter, in this country, are remarkably 

 free from intercalated beds of clay, as compared with sections more to the 



Upper tertiary sand- eastward. The whole of the enormously thick 

 Btones * group of upper tertiary beds here assumes a 



strongly upper Siwalik character; fossil mammalian bones occur, and 

 towards the top of the series zones of crystalline pebble conglomerates 

 or, in their absence, of drab clays, occupy the sections. 



In the Khasor range and Marwat hills about Shekh Budin, palpable 



Overlap or unconform- overlap, which may even amount to unconformity, 

 ltv - though occurring here between almost parallel 



bedded groups, is more evident than I have found it to be anywhere 

 along the Salt Range. The eocene limestones at the eastern end of the 

 latter range disappear from the series entirely, and here they are again 

 wanting, the cretaceous and Jurassic formations for a long distance being 

 also absent. 

 ( 234 ) 



