60' BOKARO COAL- HELD, 



The Raniganj group overlaps them in the neighbourhood of Hosir 

 an J Sarum, and north of Loogoo hill they are overlapped by the 

 Panchets. 



Suroohera. — Near Suroobera they dip to the north-east, increasing in 

 the angle of inclination from the bottom upwards, 

 from 36° to 48°. The Bokaro runs in a north- 

 easterly direction, and exposes the beds, cutting them directly at right 

 angles to the strike. 



The lithological nature of the rocks is clearly visible. It is observ- 

 able that although the series is mainly composed of carbo-argillaceous 

 shales, with arenaceous ironstones, there are many beds of sandstones 

 occurring at pretty regular and short intervals. The sandstones are 

 generally slightly calcareous and highly micaceous and felspathic, 

 resembling in almost every respect the yellow sandstones of the Raniganj 

 o-roup. In fact commencing towards the upper portion of the Barakars, 

 and throughout the middle and upper groups, these sandstones are 

 persistent. 



The shales are usually grey, and not so impregnated with carbon 

 as those of the Raneegunj Field. In the Hoharoo, however, they are 

 deeper coloured than those in the Bokaro. 



In the. lower portion of the group, the ironstones are replaced 

 by very fine whitish siliceous and slightly calcareous sandstones, often 

 yellow. These differ from the yellow sandstones both of the 

 Rdniganj and Barakar groups. Those of the former being more calca- 

 reous ; whilst those of the Barakars are often slightly reddish, contain 

 pieces of mica, and fragments of stems and leaves, and present a bluish 

 appearance on the fractured surface. 



The section of a series so uniform throughout, is scarcely requisite. 

 The upper portion of the group is exposed near Bassutpoor, and any one 

 ( '^^ ) 



