114 



KHASI HILLS. 



(see Section), while at the same time the highly and largely crystalline 



texture of the small and minute veins shews that the whole mass must 



have been in a highly heated condition when they were formed. 



In the Eastern portion of the hills, similar rocks are met with in the 



„ . , . -r, . valley of the Mentedoo. They occur in thin layers 

 Gneiss, &o., m East of •^ j j 



•"^'s- of gneiss and mica slates dipping at high angles 



(60° — 70°) towards the N. and N. E., abounding in small quartz veins. 

 They are much less contorted than in the Western portion of the hills, 

 and are here capped by horizontal beds of sandstone. The gneissose 

 rocks continue all up the valley of the river, forming the talus or slope 

 of the high ground on either side. At Joowai village, and stretching 

 along the top of the ridge on which it is placed, for some Httle distance 

 towards the East, a thin capping of horizontal beds of sandstones and 

 conglomerate, forming an outlier of the more extensive beds to the 

 South-East, conceals these rocks, and affords an excellent instance of 

 the total unconformability of the two series. (Fig. 4.) 



Fig. 4. 



