GEOLOGY. 97 



Durlipali seam is about 500 feet from the bottom of this 

 division. 

 4 In this, the lowest division of the Barakars, the gradation 

 from shales to sandstones pointed out above appears to 

 be completed ; no arenaceous nor argillaceous shales 

 were seen. At the top come conglomerates, \ resting 

 unconformably on white sandstone — see section B— 

 well exposed near the Eeb bridge both in the river-bed 

 and also on the tops of the hills near Telanpali just 

 north and south of the bridge. Below these come the 

 typical coarse-grained Barakar sandstones towards the 

 top of which a distinct white band of sandstone, about 

 8 feet thick in places, occurs. These sandstones are 

 100 feet or more in thickness and form the conspicuous 

 line of hills running from Telanpali on the right bank 

 of the Eeb to Malda on the left bank of the Bonum, 

 ranging from 50 to 100 feet or more in height. The 

 actual sandstones abutting on the Talchirs were no- 

 where seen but the lowest observed were coarse-grained 

 though rather fine-bedded and micaceous. 

 The boundaries of the areas of the various zones into which I 

 have divided the Barakar rocks are by no means 

 vad^Zones of°V£ easy to define all over the Field. It is possible, 

 sideratfons general con * however, in some parts to establish approximate 

 boundaries between these zones and by means 

 of these considered in conjunction with data obtained from boreholes, 

 to fix the relative horizons of the various seams proved and to 

 arrive at a fair estimate of the thickness of the Barakars not proved 

 by boreholes. 



Considering first the lowest or sandstone series and starting in the 



The sandstone congio- Lillari on the west, no conglomerates are seen 



meratezone. in the neighbourhood nor any of the massive 



coarse grits typical of this series. The hill between Kiraruma 



and Durlipali is of a type of sandstone (slightly massive) which can 



be referred to any of the series. Indeed, were it not that the rocks 



( 9 ) 



