12 * BOKARO COAL-FIELD. 



against the metamorphics, clearly indicating a throw. Doubts, however, 

 again arise on examining the section in the small stream west of 

 Kodwa, as we there find real and typical Barakar sandstones near the 

 edge of the field. Proceeding up the river, the beds which at the 

 bottom are highly inclined continue at the same or nearly the same angle, 

 and assume all at once the characters of the Raniganj group. These 

 strata are conformable to those of the Barakars, and I see no other ex- 

 planation which clears away difficulties so easily as a fault. The Barakars, 

 then, at this portion of the border are represented as being south of the 

 fault. In support of this view, the section of the Dhungurdhugwa, 

 another small stream, to the east of Kodwa, lends great weight. The 

 Barakars are highly inclined, but dip to the north-north-east, while the 

 Baniganjs dip to the north-west. This change in the direction of dip is 

 very marked, and such a striking contrast manifestly indicates a fault. 

 Of course it might be due to overlap, but as we already have a fault, which 

 is evidently full of vigour, where we last parted with it, a contrast in 

 strike occurring in the line which would be pursued by the continuation 

 of that fault, is most probably owing to the only cause to which we can 

 appeal after excluding overlap. 



South-east of Gosee, the extension of the fault is slightly obscure, 

 but west of that village, the evidence is clear. The limit of the field 

 is natural to the north of Juggaysur, being faulted only locally once or 

 twice, and for only very short distances. 



Western boundary. — The western boundary is broken, but speaking 

 broadly, it may be called natural. All the faults which occur are ones 

 parallel to that described above, and none are north and south displace- 

 ments or approximately so, as they would be if the west border were 

 faulted. 



Northern boundary. — The north edge of the field is the mixed efiect 

 of pure denudation and faults. In the vicinity of Tapin Pindra, and 

 (50) 



