it 



In. 



8 







5 







2 







1 



6 



5 











6 







8 







5 



4 







24 MALLET : GEOLOGY OF DA1UILING AND WESTERN DUARS. 



Sandstone 



Blank for 150 yards along the road. 

 Sandstone 

 Grey shale 

 Coal 1' 0" to 2 ' 6" — may he one of the above beds ; it is 



nearly in the same strike 

 Sandstone (dipping N. 15 W. at 35°) 

 Grey shale ... ... ... w 



Sandstone 



Grey shale — 



Sandstone 



Less than 100 yards further on some greenish slate is seen, and a 

 little beyond that some beds of Damuda sandstone, with one or two 

 thin coal seams. Beyond that again the Daling slates come in finally. 



In the ravine, which runs just south of Mr. Partridge's bangalo at 

 Tindharia, the finest coal seam yet found occurs. 



Tindharia ravine. 



In the bed of the stream it dips west 15° north at 

 80°, and has a thickness of 11 feet, with shale below it and sandstone above. 

 This is one of the seams which I recommended for exploration by horizon- 

 tal drifts. The latest result shows that at 40 feet in from the outcrop the 

 thickness is reduced to 6 feet ; but as such variations are, in the main 

 at least, due to crushing, not to thinning out of the seam, it is very 

 probable that as the drift progresses further the thickness will again 

 increase, and the seam may be found continuous for a long distance, 

 although subject throughout to similar variations. 



Lower down stream indications of two or three other outcrops 

 occur. One of these, a couple of hundred yards below the 11 -feet 

 seam, was opened out by Mr. Montfort, who found a seam of about 

 6 feet, dipping west-north-west at a high angle. It is to be remembered 

 in dealing with seams of such uncertain thickness and subject to so 

 much disturbance, in ground where the strata are only exposed at 

 intervals, that several outcrops may in reality only indicate one or two 

 seams. 



( 24 ) 



