24 Anniversary Address. 



this part of Bundelcund, greenstone follows the strike of tlie 

 so-called grauwacke in the bed of the Nerbudda Eiver, and 

 basalt forms the overlying sti'ata, another analogy with the 

 Cudgegong diamond district. 



Mr. Broderip considered the rocks to be Jurassic, and scarcely 

 distinguishable from the white Lias of Bath. 



As to the saliferous beds, Mr. Malcomson says, there is not a 

 rock formation in India from granite to recent alluvium in which 

 salt does not exist ; and he further states, that the sandstone, 

 covering 800 miles of latitude and 400 of longitude, is everywhere 

 above the limestone which Captain Eranklin calls lias. 



In 1853, Mr. Carter, in his " Summary of the Geology of 

 India," {Bomhay Asiat. Soc, 1854,) also adopts the view that 

 these Bundelcund diamond rocks are Jurassic. 



D'Archiac {Frogres, vii., 644,) repeats Carter's statements, 

 and puts the diamond-bearing conglomerate toith a note of 

 interrogation above the Punnah sandstone, and much above the 

 Carbonaceous shales of Kuttra. 



I would here wish to remark that these beds must be 

 distinguished from those which hold Olossopteris, and which 

 paralleled with the African Karoo beds, Mr. Tate (Q. J. XXIII.) 

 in 1867, considered Triassic, whilst Dr. Oldham, the experienced 

 and able Superintendent of the G-eological Survey of India^ 

 agrees with me in assigning them to a Palaeozoic epoch. 



But inasmuch as coal may exist in the Jurassiac or Triassic, ag 

 well as Upper Palfeozoic formations, the proximity of a ccal- 

 bearing formation to the diamond rock leaves the question as to 

 the origin of diamond in such a formation just where it was. 



Since the establishment of the Indian Survey, u.nderits present 

 enlightened Superintendent, the Messrs. Blandford and Mr. 

 Theobald have explored large tracts of India, and have given their 

 opinion, in which Dr. Oldham concurs, that the Nagpur, Damoodah, 

 and Talcheer, as well as other Bengal coal-fields, cannot be 

 younger than Permian. {Mem. Ind. Surv., i., 82.) These beds 

 in the Damoodah group ho'd many species identical with those 

 of our New South "Wales coal districts, including the outlying 

 patches on the Cudgegong. 



