28 mallet: geology of darjiling and western duars. 



sandstone, with carbonaceous partings here and there. A few yards 

 higher up, these give place to light-green (Daling) slates, no uncon- 

 formity being apparent. 



Just north of the Tertiary-Damuda boundary in the Lehti, a thin 

 seam of greatly crushed coal, underlying coarse 

 quartzose sandstone, is visible. About half a mile 

 in a straight line higher up stream, there is a deep gully on the south 

 side of the naddi, in which a very fine section is exposed. The strata are 

 inverted, the Damudas overlying the Dalings, and both inclining to 

 the south at about 30° ; although the dip of the Damudas is tolerably 

 steady on the large scale, small, but sharp, contortions occur. The strata 

 are here in their most altered condition, the sandstones having been con- 

 verted into a well-foliated schist, in which the laminse of quartz are 

 divided from each other by carbonaceous or by chloritic matter, and 

 minute cubes of pyrites are often sprinkled through the rock. 



The Tertiaries appear to be cut off by a fault near the debouchure 

 of the Lehti, and no remnant of them is found to 

 the eastward for several miles. The Damudas 

 are met with for some distance along the left bank of the Ranjang, 

 dipping easterly at low angles, and covered, at a varying height above 

 the stream not exceeding 100 feet, by the Daling slates. They here 

 consist chiefly of coarse quartzose and quartzo-felspathic sandstone, 

 including specks of carbonaceous matter and of silvery mica. There are 

 also some shaly beds, and a few nodules of ironstone, and numerous thin 

 layers of coal, besides one seam of 3 feet 6 inches, dipping north-east 

 at 15°. 



The Damudas are found again in the Pugo naddi, consisting chiefly 

 of crushed sandstones with some shale and thin 



Pugo naddi. 



seams of coal. They dip mostly to north 30° 

 east, at 50° — 70°, and are covered on the north-east by the Daling slates, 

 which on the west are brought against them by a fault. 



( 28 ) 



