-14 BALL : GEOLOGY OF ATJRUNGA AND HUTAR COAL FIELDS, 



Aui-unga field is at Rampur on the eastern margin 300 feet^ and at 

 Latiahar, if the elevation given on the map be correct, more than 600 

 feet below the watershed at Balumath. But when we find outlying 

 patches of the Barakar rocks at elevations of from 150 to 200 feet higher 

 than the neighbouring parts of the Aurunga field, and other patches 

 which there is good reason to believe exist at still higher elevations in 

 the highlands on the south-east and south,* we are compelled to suspect 

 that the Aurunga field has subsided as a whole. That such has actually- 

 been the case seems to be incontestibly confirmed by the intense faulting 

 and tilting of the beds in that field, as is indicated on the map, and will 

 be fully described on a future page. 



Similarly, the Hutar field shews evidence of having been let down to- 

 wards the west by faults, which have tended to iso- 



Hutar field let down |^^g -^ ^^j g^j^gj, ^^e pre-existing general directions 

 by faults. . 



of the drainage. There is, however, much less 

 lithological resemblance as regards the lower groups of rocks between the 

 Hutar and the Aurunga fields than there is between the latter and the 

 Karanpura,, and there is therefore less ground for assuming an original 

 continuity, though such may possibly have existed. 



Without trenching on the subjects which belong strictly to sub- 

 sequent sections, it is impossible to enter here more fully into this part of 

 the question. But so much, as affording a preliminary view of the origin 

 of the present structure, was necessary to make what follows intelligible. 



This central Palamow valley, then, was probably originally continuous 

 with the Damuda valley separating the Hazari- 



Central valley origin- 

 ally continuous with the bagh plateau on the north from that of Lohardugga 



or Chutia Nagpur on the south.'' Towards the 



a The disturbance and tilting of some of the beds on the margin of the Karanpura 

 field perhaps indicates some upheaval, but may, on the other hand, be due to lateral pressure 

 from within. 



*• The origin of the valley as a whole, which is a distinct question from its separation 

 into two, will be treated of on a future page in the section on the rocks of Mahadeva age. 

 ( 14 ) 



