36 BALL : GEOLOGY OF THE RAJMEHAL HILLS. 



is reached. Here, as has already been pointed out, there is an inconsider- 

 able thickness of Barakar rocks resting partly upon Talchirs and partly 



Rocks obscured by al- U P 0n S neisS ' The Section in the river is exceed " 

 luvram. ingly imperfect, the rocks having become much 



covered up and obscured by alluvium. 



The following section is taken from the mouth of the Manikbutthan 

 stream and proceeds eastwards. It indicates an extreme poverty of coal 

 seams in these rocks : — 



Gumani river section. Dip 13.° Strike 10° west of north. 



1. Greenish and grey sandstones with blue and carbo- 



naceous shales, latter obscure ... ... 28' 



2. Greenish and grey sandstones with thicker layers of 



carbonaceous shale ... ... ... 27' 



3. Carbonaceous shale, portions coaly ... ... 12' 



4. Coarse false-bedded grit with lenticular masses of car- 



bonaceous shale ... ... ... ... 14' 



5. Seam, upper half a 3rd or 4th rate coal, lower half 



probably useless «. ... ... 9' 



6. Grey sandstone with carbonaceous markings ... 1' 2" 



7. Seam of carbonaceous and coaly shale, character variable ; 



upper portion has been on fire, leaving a pinkish-white 

 shaly ash of original dimensions in situ, about ... 6' 



8. Blue and blackish, argillaceous and sandy shales alter- 



nating ... ... ... ... 7' 



9. Sandstone ... ... ... „. 15' to 20' 



Beyond this the next rocks seen are hornblendic and granitic gneisses, 

 which form a small inlier. 



It is, of course, possible that coal may occur in portions of the sec- 

 tion which are not exposed ; but the inference to be drawn from the 

 occurrence of this and another inlier of gneiss, to be mentioned further 

 on, is that the total thickness of the measures, and consequently the 

 amount of coal, should any exist, must be inconsiderable and of uncertain 

 extension. 



( 190 ) 



