BANKI SECTIONS. 39 



very difficult to make out the relations of beds in the dense jungles 

 which cover every square mile of ground in this field, 



7. — Section along the Nullahs between Bagra {North) and Laioa (South). 



In ascending- order : — 



North : village of Bagra on mica schist. Just south of that place a series of 

 low ridges extend in a nearly east-westerly direction, being composed of 

 a hard porous (cellular) rock, resembling Eauchwacke. This rock puz- 

 zled me a good deal at first, but afterwards I found that it is merely 

 filling up the long lines of fault, scarcely without interruption, and I 

 obtained clear sections through it afterwards near Palgi and also south of 

 Lundra, where the relation to the other rocks is unmistakeable. Imme- 

 diately south of this ridge I found sandstone and shales of probable 

 Eaniganj age faulted against the old rocks, but so shattered that a 

 succession of beds could only be obtained here and there. 



In descending order^ a short distance further down stream^ I could 

 make out : — 



1. An unevenly bedded red grit or sandstone in thick masses, very soft, strike 



north-west to south-east, dip south-west. 



2. Thin-bedded red hard ferruginous sandstone, in places with a good red iron 



ore, denuded into furrows and ridges on the surface, not unlike some of 

 the partings in the Mahadeva sandstone. Quartz pebbles and grits in 

 strings. 



3. White sandy beds, very soft, dip 5°, to south-west. 



4. Coarse-grained sandstone. 



Trap dyke, showing concentric structure here and there, strike east-west, 

 thickness 36'. 



5. Sandstone, ferruginous. 



These beds, however, are so much shattered by local faulting that it 

 would be impossible to say with any degree of certainty to which group 

 they belong ; and in addition, the nullah does not afford a good 

 section there, the rocks being obscured by alluvium. But a little further 

 down, clay shales of a Barakar appearance come in, which I have classed 

 as such on the map. From there the section is an ascending one, but 

 still, and for some distance, disturbed by faulting. However we get 



f 167 ) 



