RECENT DEPOSITS OP NERBUDDA VALLEY. 281 



Unio and Corbicula and cemented by carbonate of lime. This in some 



parts is beautifully crystalline and in sufficient quantity to appear to 



constitute the base of the rock. The thickness is here not seen, but is 



probably inconsiderable, perhaps not more than 5 or 6 feet. 



Resting on this conglomerate occurs the clay before alluded to, which, 



wherever seen, presents the same uniform aspect, 

 Reddish yellow clay. 



and is in many places the only remnant of the 



lower group which has escaped denudation, prior to the deposition above 



it of the upper alluvium and regur. 



Its character is that of a stiff fat clay of a deep reddish yellow colour, 

 somewhat mottled on its exposed surface and containing concretions of 

 kunkur, though not so abundantly as do the beds overlying it ; also bones 

 and shells, the former very sparingly, the latter more plentifully but 

 locally distributed, so that it generally appears entirely deficient in 

 organic remains. 



This clay is well exposed in the banks of the Baru Rewa Nullah, 

 below Garrawara, where it is covered by the alluvium of the upper 

 group, but the unconformity of the two deposits cannot here be clearly 

 made out owing to the complete parallelism of the beds of either group, 

 and the regularity with which the beds of the lower group have been 

 denuded and removed. In one or two places however little channels 

 may be noticed, furrowed in the surface of the reddish clay, which 

 sufficiently prove the extent of denudation to which the lower group had 

 been subjected previously to the deposition of the upper. 



The clearest section exhibiting the unconformity of the two groups 



Section at Deva- * s Seen * n ^ ie ^ an ^ °^ tne ^ ner I1Yer > at * ts j un C- 



cachar * tion with the Omer near the village of Devacachar, 



of which the following is a sketch, the horizontal distance being slightly 

 curtailed. 



