1S60.] Proceedings of the Asiatic Society. 319 



Chamberlain's expedition against the Wuzeerees. Dr. Stewart is 

 devoting his leisure moments, principally to botanizing, I believe, but 

 he has in his note given some geological details which are of great 

 interest. It has hitherto been supposed that the rocks representing 

 the Siwalik group extended very much further to the west from the 

 plains of upper India, even beyond the Ghilza range, but this note 

 shews the occurrence of nummultic beds within a very few miles of 

 Tak. 



The soft sandstones and conglomerates are, I think, clearly the 

 Siwalik group, and probably the upper portion of this enormously 

 thick series. The physical structure of the hills there, also, appears 

 to correspond with that of the Siwalik hills here. They run to the 

 X. "W. presenting a scarp to the plains of beds dipping sharply into 

 the hills. The calcareous beds associated with red, greenish, and 

 white shaly beds rapidly disintegrating into earthy masses seem to 

 represent the lower part of the nummulitic series ; at least this is the 

 general character of that part of the group in these hills. The layers of 

 chert or flint are frequent here as there. If this conjecture be correct, 

 it must follow that there, as here, a great fault separates these 

 two series. 



The remarkable fact of the streams cutting across the ridges of the 

 outer or Siwalik rocks is abundantly paralleled here too, and nothing 

 is more striking on passing up the river gorges here than the marked 

 plateaux or terraces of gravelly detritus which occur at various levels, 

 such as are noticed in Dr. Stewart's note. 



I sincerely hope to have further information from the writer of the 

 interesting note regarding a country of which we know so little. 



Tours sincerely, 



(Signed) T. Oldham. 



Since forwarding the above notes, specimens of the iron stone used 

 on these hills has been received from the Government of the Punjab, 

 and submitted to assay in the Geological Survey Office, Calcutta. The 

 results are as follow. 



The specimens consist of samples of a rock which is itself composed 

 of iron ore in two distinct conditions. 



(a) One portion is a common hydrous peroxide of iron containing 

 40.4 per cent, of iron. 



