358 On the rocíes of the Demuda group. [No. 4, 



means certain that the beds of Orissa and Central India are of the 

 same age. 



The age of the rocks associated with the coal of Bengal is still 

 undecided, but it is to be hoped that the examination of the reptilian 

 remains from the Panchit beds may throw some light upon the 

 question. The oceurrence of the little iEstheria, a crastacean sin- 

 gularly abundant in the Trias of England and Germany, the coal 

 field (Lower Mesozoic and probably Triassic) of Bichmond, Virginia, 

 U. S., and in Nagpúr in connexion with a reptile belonging to a 

 group peculiar to the Trassic and Permian periods, (Hupert Jones 

 on iEstheria Minuta, Quarterly Journal, Geological Society, XII.) 

 seems to add weight to the gradually accumulating evidence in favor 

 of these beds being classed with the still imperfectly known groups 

 which are considered by European geologists to form the cióse of the 

 Paleo zoic and the commencement of the Mesozoic epochs. (See Pro- 

 fessor Oldham's paper on the geological relations and probable 

 geological age of the several systems of rocks in Central India and 

 Bengal. Mem. Geological Survey of India, Vol. II. p. 295.) 



There are three localities whence more aecurate determination of 

 the age of these rocks may be expected. Of these one is in Australia, 

 the other two in India, on the banks of the Godavery, S. of Nagpur 

 and in Cutch ; and the attention of all interested on the Geology of 

 India should be directed to the desirability of obtaining all possible 

 aecurate information from these places. 



The following diagram represents the views above put forward of 

 the relations of the diíferent series referred to together with their 

 distribution throughout Eastern and Central India. 



Eániganj. Eájmahál. Orissa. Nurbadda valley. Nagpwr. 



1. J? „ Máhádevas ? Máhádevas. Lametas. Máhádevas. 



2. „ Kájmaháls. „ „ „ 



( Upper Pan- Cong l merates. ) Upper Damudas of Mangáli 



3 - ) x chlts ; C Jubbulpur. shales. 



(^ Lower do. „ ) 



rRániganj ^ ? "1 



series. > „ „ ! 



4. <j Iron stones. ) )■ Damúdas. 



I Lower Da- 



^ mudas. Lr. Dms. Lr. Dms. Lr. Dms.J 



5. Talchirs. Talchirs. Talchirs. Talchirs. ? 



