DAMUDA SERIES. 17 



sandstone with a few specks of mica. The quartz is white and the 

 felspathic element buff, giving the rock itself a pale buff color ; occasionally 

 there are some thin pebbly layers, the pebbles being of white and red quartz. 

 Besides these beds there are soft shaly micaceous sandstones, with faint 

 vegetable impressions, and dark-grey micaceous shales, in which tolerably 

 well-preserved plant-remains occur, the commonest being ghssopteris. 

 Four or five carbonaceous beds outcrop in the ravine : firstly, that above 

 mentioned; then one of 18 inches, which includes two layers of coal; this 

 is separated by a few feet from a bed of carbonaceous shale, 3 or 4 

 feet thick, containing a 9 -inch seam of coal. Some distance further 

 up there is a fourth carbonaceous bed, including some strings of coal. 

 The strata in this section dip mostly to north-west at an angle oMrorn 

 40° to 70°, 60° being about the average. 



The Damudas in the Rangichang dip mostly towards the north-west 



„ at an angle of from 40° to 90°. Some coaly layers 



Rrfngichaiig naddi, & \ J 



are visible, but the best is only 12 inches thick and 

 contorted on a small scale, as well as broken up by closely contiguous slips, 

 of a few feet in throw. The beds, hereabouts, are little altered, but higher 

 up stream they are in their most metamorphic condition, comprising hard 

 quartzites dark-colored slates and graphitic schists. The last is a truly 

 foliated rock, composed of lenticular laminae of quartz included between the 

 folia? of impure graphitic matter. It has probably resulted from the altera- 

 tion of carbonaceous shale, the carbonaceous matter in which has been 

 partially changed to graphite. One of these bands in the Rangichang 

 is 15 or 20 feet thick. Higher still up stream, silvery clay slates come in, 

 which are included with the Daling rocks. 



The Damudas are well exposed in the Rakti naddi. The contor- 

 tions of the beds render it difficult to measure the 

 Rakti naddi, 



section accurately, but the following is close 

 enough to give a good idea of the general succession of strata. In the 

 lower part of the gorge the stream flows through Tertiary sandstones ; 

 c ( 17 ) 



