48 GRIESBACH : EAMKOLA AND TATAPANI COAL-FIELDS. 



506 H. T., which is composed of red grits and sandstone with red clays 

 beloWj which I identify with the Panchets, as shown in the eastern 

 sections. These strata cover the Raniganj below, forming an oblong 

 patch on them. 



South of the Iria nullah the Raniganj series is cut off by a fault, 

 probably the same which I observed south of Karamdiha, but here it is 

 well shown in all the nullahs coming from Kotrahi and Garia. The 

 direction of this fault is then west-1 0°-south to east-10°-north, the 

 fracture is nearly perpendicular with a slight dip to the south, bringing 

 the sandstone and shales on the same level with the adjoining Mahadeva 

 sandstone. The fracture is filled up with fault-rock, very ferruginous 

 and hard, which is less affected by subaerial denudation than the adjoin- 

 ing rocks, and consequently is left as a wall-like ridge of about 5 feet in 

 thickness standing high above the sandstones. 



13. — Section along the Balsotha Nullah. 



The Balsotha nullah and the nullahs west of it falling into the Iria 

 and Morne have denuded away the whole of the Panchet grits and 

 Raniganj beds and left only the Barakars in shattered remains, bounded 

 on the north by the fault between Chorki and Geruani, and along the 

 south and west by the Mahadeva hills, which are faulted against the 

 Barakars, as is well seen in all the river sections. 



The section along the Balsotha Nullah between Saura on the north 

 and the Iria nullah south is as follows : — 



Saura village is on tourmaline granite, and the fault boundary with 

 the Gondwanas is shown well in the bed of the river, where a ridge of 

 porous fault-rock (chiefly quartz) fills up the fracture. 



In ascending order : — 



Barakars. 



1. Pine-grained sandstone and shales with shaly sandstone, dip 35" south- 



east. 



2. Grey and variegated conchoidal shales. 



3. Coal, with partings of shales, thickness 2' 6", dip 25° soulh-east. 



4. Ripple-marked variegated sandstones. 



5. Bituminous shales, with thin partings of coal, thickness 1'. 

 ( 176 ) 



