Economic Geology of Assam. [No. 4. 



List of specimens subsequently forwarded illustrative of the Econo- 

 mic Geology of Tipper Assam. 



1. Kaolin Clay or Roohnunsee Feeta. — This is the washed clay 

 from a decomposing granitic rock, probably composed of silex and 

 alumina. It appears to be infusible without admixture. A very 

 short distance inland from the mouth of the Doza Panee, a small 

 river on the upper Brahmaputra, large masses of this substance are 

 found in different stages of decomposition, some in a state of pow- 

 der and accompanied by debris of felspar and limestone rock. It 

 can be procured in any quantity and can be brought down the 

 Brahmaputra in small boats. 



2. Washed clay from a decomposing Felspar Roch. — The decom- 

 posing felspar is deposited in large masses on both banks of the 

 Degaroo river, Upper Brahmaputra, at the foot of the Northern 

 mountain ranges ; and in the same line East and West is a common 

 deposit. The deposit is extensive, but its distance from the Brah- 

 maputra would make its transport difficult and expensive. 



3. Washed clay from decomposed Felspar Roch or Marl. — This 

 is found in the vicinity of limestone, at the falls of the Namber 

 river, Golaghat district. The deposit is large and accessible at all 

 times, and, by means of the Namber and Dhunseree rivers, water 

 transit is easy during the rains. 



4. Washed clay from decomposing Felspar Roch. — This rock in a 

 state of decomposition is found in the bed of the Namber river, 

 under the falls, associated with the shell and slaty compact lime- 



The largest of the cannon made during the sovereignty of the Assam Rajahs 

 is still visible within the fort of Rungpore. This cannon was presented to Rajah 

 Rajeswar Singh by Bohikhowa Bur Phokun of Gowhatti. 



It is fabricated entirely from Cossyah wrought iron, and is remarkably well 

 finished, its dimensions are as follows : — 



Length from end of handle to sight on the breech, 5 ft. 10 inches. 



Ditto from breech to muzzle, 12 ft. 3^ in. 



Measurement round the breech, 5 ft. 7 in. 



Ditto round the muzzle behind the ornamented ring of ditto, .. 5 ft. 1 in. 



Diameter of bore, 6£ in. 



Total length of gun, 17 ft. 3§ in. 



Thickness of metal, 7f in. 



