KHASI HILLS. 127 



village and Mawreng. I allude to the occurrence of veins of granite 

 Veins ofgranibe in these percing them. These veins are in places one to 

 Kindstonea. ^^^ fggj. ^j^[^-^^ ]^^^ generally smaller ; they bifurcate 



and pass across the bedding of the rocks, or along the planes of deposi- 

 tion; these planes being much contorted. The veinstone is a highly 

 felspathic, but smally crystalline granite ; mica black and brilliant ; the 

 quartz greyish-white, and the felspar with a slight pinkish tint. This is 

 the only place where I have seea this fact exhibited. 



Unfortunately no organic remains whatever have been observed in 



this group of highly altered sandstones ; and I 

 Probable age. 



had no opportunity of examining more than a 



limited area, within which the actual connection of these sandstones with 

 the decidedly tertiary beds of the vicinity of Cherra Poonjee could not be 

 traced. But, taking into consideration the horizontal and undisturbed 

 position of the tertiary group, as contrasted with the strangely contorted 

 and upturned arrangement of the other, the loosely coherent and soft na- 

 ture of the one as compared with the intensely hardened and metamorphic 

 character of the other ; and the fact just mentioned that these altered 

 sandstones are penetrated by granite veins, while the tertiary sandstones 

 rest undisturbed upon the unequally denuded surface of granite, I have 

 little hesitation in thinking that there may be here remaining portions of 

 a much older group of rocks : possibly, the representatives of some of the 

 rocks which occur in Central India and elsewhere. 



This important question can only be solved by a careful survey of the 

 country to the West and South from Mow-phlang, which I was unable to 

 visit. 



Separated by some miles distance from the sandstones near to Mow- 

 phlang, and forming an isolated cap of very 



OutUers of tertiaiy ^ &' » f J 



sandstones. limited area, on the hill close to the village of 



Nungbri are some beds of coarse soft grits, of a yellowish-red tint, with 

 finer sandstones and thin earthy layers. The total thickness of these 



