3' 





4' 





r 



9" 



3' 



4" 



1' 





r 



6" 



DAMUDA SERIES. 37 



Further east, close to the road-crossing marked on the map, there 

 are several layers of slightly coaly carbonaceous shale associated with 

 sandstones ; they are best seen on the northern bank, whence they can 

 be traced inland, running under the Chuperbhita range, formed of Dubraj- 

 pur sandstones capped by trap. 



Section beyond road- Beyond the locality just mentioned, the follow- 



crossing. j n g section is met with : — 



Dip 10° — 12° north-east — disturbed. 



1. Bluish earthy slightly carbonaceous sandstone changing 



to carbonaceous shale near top 



2. Stony black coal, portions combustible 



3. Blue carbonaceous shales 



4. Sandstone 



5. Same as No. 3 



6. Lenticular mass of blue sbale, at thickest 



7. Sandstones with similar masses to 6 : upper portion 



of this consists of typical Barakar grits. Some of the 

 lenticular masses are slightly coaly ... ... 25' 



8. Blue shales, dip variable ... ... ... 12' 



The remainder of this section is very indistinct. The stony coal, 

 and apparently some below, now covered up, were quarried by the late 

 Mr. Barnes of Colgong, but the stuff obtained was not thought worth 

 carting away as Mr. Barnes himself informed me. 



Between this and the Dhamni bungalow, sandstones appear in two 

 places; the river section, with these exceptions, exposes alluvial banks 

 only. Beyond Dhamni, too, till the boundary is reached, no rocks are 

 seen. At the boundary some beds of sandstones have been protected 

 from denudation by the overlying basaltic trap. 



The geological structure of the closed valley north of Dhamni is of 



a peculiarly interesting character. In the southern 

 Dhanmi valley. .',"_..- 



portion, Barakar sandstones, though much covered 



up in the higher ground, are still sufficiently clearly laid bare in the small 



streams. On the east these sandstones are overlaid by the basaltic 



( 191 ) 



