NAMBOR COAL BEDS. 89 



the outcrop may continue to the north, where no definite exposures 

 are seen, and may connect it with the coal-bearing rocks of the 

 Doigrung river, described by LaTouche,! though the lithological 

 diversity of the strata in the two streams does not seem in favour of 

 their close connection. 



The exposures on the Nambor are entirely under water, even 

 in the dry season, so the coal would be useless, unless traced on to 

 higher ground. Three sheets of coal are seen in the river, but the 

 section is so broken, that it is difficult to say how they are con- 

 nected with each other. 



For 8 miles above the falls, the Nambor traverses massive 

 gneiss. Above this a gap of a quarter of a mile occurs, with no ex- 

 posures. Then a seam of 2 feet of coal occurs, resting horizontally 

 on coarse white sandstone, and visible for about 30 yards. Above 

 this is another gap of 200 yards ; and then a sheet of coal, a few 

 yards in length, and 2 to 3 feet thick, is seen overlying whitish clay- 

 shale with leaf traces, with a gentle dip to north-east. A hundred 

 yards above this a bed of fine, white, felspathic sandstone, with fre- 

 quent small concretions of vesicular pyrites, occurs dipping gently 

 north-east apparently under the shales and coal. 



A broken section of this sandstone is visible on the river bank, and 

 the dip changes from north-east down stream to north-west up-stream. 

 Another 100 yards of blank section follows, and then the main coal 

 sheet appears, overlying similar light-grey clay-shale, with a dip of 

 8° W.N.W., and so apparently overlying the white sandstone. 

 Above this exposure nothing is seen except the massive gneiss. 



The last coal-seam forms a considerable sheet over the whole 

 stream bed, about 10 yards in breadth and 20 in length. The 

 dip of 8° is seen over an outcrop of 55 feet, giving the seam a 

 minimum thickness of 7 feet, 



LaTouche describes the coal seen on the Doigrung — about 3 

 miles north-west of the Nambor coal — as a seam 3 feet in thickness 



l Rec. Geol. Sur., Ind., XVIII, Pt. 1, p. j'i. 



( 8 9 ) 



