TALCIim SERIES. 



The lithological characters of these rocks having been fully detailed 



in previous memoirs, it is unnecessary to repeat 

 Lithological characters. 



them here. 



A reference to the map will clearly show to what an extent the 

 Bar^kar, unconform- Talchxr rocks have been overlapped by the lower 

 Damudas or Barakars. Throughout nearly half 

 the extent of the natural boundaries, Barakar rocks are found resting 

 immediately upon the gneiss. This,, to a certain extent) a proof of un- 

 conformability is not always a reliable one. That the Talchirs were 

 denuded before the deposition of the Barakars is, however, satisfactorily 

 proved by the occurrence, near the village of Gopo, of a sandstone belong- 

 ing to the latter group which contains rolled fragments of green silt- 

 shales, unmistakably derived from Talchir beds. 



The largest and best exposure of Talchirs occurs in the northern 

 Best exposure of Tal- extremity of the field in the neighbourhood of 

 Poonoo. The principal rock there is the boulder- 

 conglomerate : such of its outcrops as were seen seemed to indicate 

 a nearly horizontal bedding ; the exposed portions are constantly un- 

 dergoing a process of disintegration, and the surface of the ground is 

 thickly strewn with the liberated gneiss and quartzite boulders, so 

 much so indeed as to interfere materially with the cultivation of what 

 would otherwise be very fruitful soil. 



In a stream north of Poonoo a section discloses a thick bed of sand- 



_ .,^. ^ stone resting on the conglomerate : it is fine, even, 



Building stone. ^ o ^ i } 



and close in texture, and would prove to be, I 

 have no doubt, a very useful building stone. 



The road from Poonoo to Paloo passes through several streams in 

 •« ^. y. m , , ' which eood sections of the lowest beds are seen. 



Sections of Talchirs. 



Although the boundary here is distinctly natural, 



still within a few feet of it the shales are inclined at an angle of 30°. 



( 113) 



