!98 NERBUDDA DISTRICT. 



separating these beds from the underlying sandstones of the upper Da- 

 mudas, which there are friable brown sandstones, and the unconformity 

 being very obscure. 



Sub-divisions b and c are not constant in their relative positions, either 

 indifferently overlying the other ; b being in fact an indurated form of 

 c, with the addition of infiltrated silica or lime. 



Sub-division d is (like a) only exceptionally present. It is well seen 

 under the*trap near Jubbulpur, but it again occupies a considerable area 

 in the Mahanuddi country to the east. 



In describing the lithological characters of the Mahadeva series a 

 set of calcareous bands were mentioned, as found 



Connection between 



the Lameta and the cal- in Saoli glen, and again in Doria end of Chatur- 

 careous Mahadeva. . ■ , . , . . 



JDoria hill. 1 hese consist ot rocks extremely simi- 

 lar to sub-division e above described. In both of the abovementioned 

 localities a thickness of limestone, properly so called, exists, for which 

 no parallel is found among the group to which we have given the name 

 of Lameta. But this limestone very frequently passes into an indurat- 

 ed marl with bands of purple and green calcareous mud, identical in 

 aspect and texture with the characteristic rocks of the formation we are 

 now describing. This resemblance is striking, and taken together with 

 the fact that the Lameta beds occupy in the eastern part of our district, 

 as the Mahadeva beds do in the western portion, a position intermediate 

 between the upper Damudas and the trap, it suggests the possible iden- 

 tity of the two series in geological age. 



The separation between the two, which we provisionally make, seems 



necessary in the present state of our knowledge 

 General considerations. ■ , _ ... .. , ; . _,, 



of the rocks. Jj rom the J ohilla valley to the bher, 



the Lameta beds are very constant in general character, and are at once 



recognized as belonging naturally to one group, whereas nothing like a 



passage of those beds seen near Karyia, into any of the Mahadeva beds 



to thewest, exists. On the contrary, the rocks of that formation seen 



