NERBUDDA DISTRICT. 171 



which have all the aspect of being identical with the plants of the Lower 

 Damudas. 



We have in this section a striking example of the great disturbances 



Disturbance and de- wllich affected the Lower Damuda and Talcheer 

 nudation. rocks and of the vast denudation to which these 



have been subjected, prior to the deposition of the Mahadeva group. 



It is however far to the north-east, in the valley of the Mahanuddi and 



_ . A . .. ,, of the Johilla Rivers, and principallv in the latter, 



Better sections to the > i c J > 



East - that the best section of the Lower Damuda and 



Talcheer groups are found. (See map.) 



In the banks of the Tawa, and of the Sita Riva their richest coal 



seams are laid open, but in the valley of the Johilla, where the river 



runs nearly at right angles to the strike of the beds, a section, several 



miles long, is seen, and a thickness of not less than three thousand feet 



of those formations exposed. The boulder bed lies 



Johilla River Section. _ 



at the base of the series here also, and the green 

 muds (the a and b of our list) are seen to pass up into earthy sand- 

 stones: these are succeeded by, and interstratified with shales and flag- 

 stones (the d and e of our list) among which some thin bands of coal 

 occur, and some of the shales contain numerous impressions of Glossop- 

 tens and Phyllotheca. 



In this place we have, in unbroken continuity, a section showing 

 Perfect continuity and representatives of all those beds which we class 

 great thickness. un( j er fa heads of Lower Damuda and Talcheer. 



The sequence seems uninterrupted ; and complete conformity seems to 

 obtain from the base up to the highest beds. No where can a line of 

 separation be drawn between the Talcheer and lower Damudas; and the 

 presumption is strongly in favor of the whole forming, here, one group. 

 It may be desirable to mention here, that in the country (beyond the 



Same Rocks found far limitS ° f 0Ur ma l D ) to the east a vei 7 similar 



t0 the K arrangement of these rocks obtains. Lower Da- 



