60 - ball: geology of the rajmehal hills. 



Even in the Mohwagarhi hill these thicknesses are by no means con- 

 stant. In one place a peak of gneiss runs high up into the conglomerates, 

 and not far from where the above section was taken, a thickness of fully 

 350' of the sandstones, &c, is exposed. 



Encrusting these rocks, just below the junction with the trap, is a 



limestone tuff which is known to the natives as 

 Limestone tuff. 



Asarkar (giants' bones). 



Some of the above rocks, e. g., the conglomerates, more particularly 

 as they appear on the northern flanks of the hill, present a strong 

 lithological resemblance to certain well-known Barakar beds; but 

 similar cases are not of uncommon occurrence in beds of undoubted 

 Mahadeva age elsewhere. And here the general 

 Resemblance to Bara- appearance presented by the section is most un- 

 like anything that is seen in the sections of 

 typical Barakar rocks in this area. 



North of the Bansloi river, Burgo* hill is formed of grits and 



conglomerates, which seem to be clearly referable 

 Burgo hill section. 



to the Dubrajpur group. These rocks rest upon 



the Barakars containing coal, which have already been described on 

 page 34. The latter appear at the base of the hill both on the north 

 and south ; but towards the east the upper beds spread on to the origin- 

 ally high-level gneiss, affording thus a very marked case of overlap. 



East of Burgo hill there is a broken range of hills formed of 



sandstones and conglomerates, which seem to be- 

 Outliers. 



long to the Dubrajpur group. But their relations 



to the underlying Barakars are not so clear as are those of the rocks 



forming the Burgo hill. In several places on the top of this range, I 



found traces of a pisolitic iron ore, which more nearly resembled the 



intertrappean rock of that composition than it did any form of laterite 



* Burgo is by a misprint Durgo on the general map. 



( 204 ) 



