170 NERBUDDA DISTRICT. 



It is not clear whether it rests on them or is faulted against them. A 

 small outlying patch of the Mahadeva conglomerate is shewn, which has 

 been faulted against these shale beds here. The amount of this fault is 

 probably very slight, as the Mahadeva conglomerate was no doubt depo- 

 sited on the denuded surface of these very beds. 



This is one of the longest known and most valuable of our sections; the 



^ , ± . c^ coal exposed (all the seams taken together) is 19 



Remarks on the Sita r v o / 



Riva Section. f eet; thick, and most of it is of very good quality. 



All the beds south of the trap dyke 7, we believe to belong to the (d and 

 e) lower sub-divisions of the Damuda : (/) the upper not being represent- 

 ed at all : all the beds north of that dyke we consider as belonging to the 

 Talcheer division (a) {b) and (c) of the same list (page 148.) 



This dyke (No. 7) certainly has not shifted the beds, nor does it mark 

 a fault, for the green earthy sandstone is seen both north and south of it, 

 and on the south appears to underlie conformably the flags and sandstones 

 of the upper part of the section. All direct connection is however cut 

 off by the fault, which probably occurs at 8, on the north of which we 

 find the Boulder bed. This displacement need not however have been 

 great, for the beds close to the dyke 7, are such as ordinarily accompany 

 the Boulder bed, (the b of our list.) 



Below this point it will be seen from the diagram, Fig. 8, that the rocks 



_, ... . exposed are greatly contorted, the dip being several 



Obscurities in super- l & J r ° 



position. times reversed in direction ; and the stratigraphical 



relation of the beds among themselves is not clearly made out; these are 



extremely obscure, and there is much in the aspect 

 Possible unconformity, 



of the series of beds below {Fig- 8,) the break at 8, 



which seems to suggest that they may belong to an older series than 



those above (to S. of) it, that is (the upper series being Lower Damuda, 



and the lower Talcheer) that there may be here evidence of unconformity 



between these two sets of beds. This is only a suggestion however, 



and is rendered doubtful by the occurrence at 11, of fossil remains 



