74 ball: geology op aurunga and hutab, coal fields. 



21. Interval in bed of river, 100' at 50° > 35° = . 68' 0" 



22. White sandstones and grits, with, blue shales, say . 50' 0" 



Total .... 1,195' 10" 



The beds included in No. 23 might pass for RaniganjeSj but in the 

 Maximum thickness of ^ig^ giound north of river there are grits and 

 Barakars. ironstones, higher in the sequence, which are, I 



think, clearly of Barakar age. If we add for these higher beds 300 feet, 

 a most liberal allowance, the total thickness would amount to something 

 under 1,500 feet. 



In succeeding sections of the narrowing Barakar zone there is clearly 



no room for the full thickness above given, and here there is no trace of 



the overlying yellow beds, which may overlap in the sections measured 



below ; but this would not account for the fact that between these beds 



(No. 22), where last seen, and the gneiss, there is not room for more than 200 



^ . , . ^, feet as against about 1,000. This indicates great 



Thickness in other sec- ° ° 



tions. thinning out and internal overlap ; in fact, in the 



succeeding sections the carbonaceous zone is scarcely represented. But 

 the sections below measure 256' 7", rising to 559' 4" as we proceed 

 eastward, and shew a decided tendency in the beds to recover this lost 

 thickness. The thinning out of the carbonaceous zone here resembles 

 its disappearance south-east of Kajbar. 



Some of the decomposed seams may contain coal, but their appear- 

 ance is not promising, and as their dip averages 60°, their economic 

 importance is slight. 



The sections above alluded to are as follows : — 



Section, in west reach of loop, south-west of Juggiddugga. 



(Gneiss seen on south bank of river.) 



1. Bed of river, rocks concealed, say 



2. Sandstones, shales and grits, 125' at 70°= 



3. Massive grit, dip 65° 



4. Seam, decomposed ...... 



5. Grits and shales, 60' at 65° > 50°= . 



Total .... 256' 7" 

 ( 74 ) 



70' 



0" 



117' 



6" 



9' 



0" 



10' 



0" 



50' 



1" 



