518 Account of a visit to the Jugloo [No. 6. 



stone crops out, as well as a hard heavy homogeneous blue-coloured 

 rock with white quartz veins. Tufaceous limestone has also been 

 discovered both in the clay slate, and in the last named rock. In 

 the steep banks of the rivers of this section of the Naga range, so 

 soon as the clay slate commences, there are numerous brine springs, 

 many of which have been open from time immemorial, and others 

 are being constantly dug out. The shafts are from twelve to thirty 

 feet deep, and always dug in the clay slate, but no workable brine 

 is found, until boulders are reached of the blue-coloured rock above- 

 mentioned, which from its hardness is called by the Nagas, Tan 

 Loung. After leaving the true clay slate there is a tract of hilly 

 ground, composed of small boulders of the foregoing rocks, with 

 ferruginous deposits as hard as the metal itself. To this succeed 

 the deposits of the lower range in which we find coal and carboni- 

 ferous strata indications, and in all the small streams which pass 

 through their tract gold is found in a rubble consisting of rolled 

 pebbles of rocks, not however visible, granite, mica schist, quartz, 

 jasper and lydian stone, with occasionally pieces of fossil wood. 

 This rubble appears of great extent, and apparently flanks the whole 

 of the Naga range from the Nao Dihing to the Dhunsiri. 



In no part of the hill streams passing through the clay slate is a 

 trace of gold to be found. 



The black debris, dug from the brine springs, contain however 

 much sulphuret of iron. The salzes also which are numerous towards 

 the plains, throw up mud, sand and gravel, impregnated with 

 sulphuret of iron. The gravel in some of them is consolidated to 

 the consistency of rock, composed of minute particles of jasper, 

 quartz and other igneous rocks : this appears stratified, but to what 

 depth is unknown. 



It may be worthy of notice also, that these salzes extend across 

 the Upper Muttuck and shew in their vicinity the same gravel 

 deposits. In the gravel of the Tepuck Jan, an affluent of the 

 Dibroo river, in the North or right bank of that river, traces of gold 

 have been found. 



In the North East section of Assam, that is round from the Nao 

 Dihing at the confluence of the Duffa Panee to the Dihong river, 

 little is known of the nature of the rocks in situ, excepting at dis- 



