METAMORPHIC SERIES. 37 



Three distinct veins were observed : the principal one occurs about 

 80 yards in from the mouth of the stream. It is from half an inch to ten 

 inches wide^, with a Aertieal underlie, and strike of about west-20°-north. 

 Tiioug-h for the most part the vein Hes parallel to the planes of foliation 

 of the pink porphyritic gneiss which encloses it, it does not invariably 

 do so. The mineral has a laminated^ somewhat hackly structure, and is 

 of a bright salmon-coloured hue with a pearly lustre. Associated with 

 it, there are plates of quartz pseudo-morphic after micaceous iron. 



A second vein occurs close to the mouth of the stream. It is in 

 places one foot wide, and the combination in it of the stilbite with the 

 pseudo-morphic quartz produces a very beautiful structure. 



A third smaller vein was noted in the bed of the Atee. Very 

 possibly there may be others also. 



Veins of pink pegmatite and epidote occur in some abundance also 

 in the vicinity of the stilbite. 



West of Hutar field the sections in the Supahi exhibit a considerable 

 variety of the ordinary forms of gneiss with veins 



Supahi river sections. ^ _ ^ 



of granite, pegmatite and quartz. Hornblendic 

 rocks are there more rarely represented, but are by no means wholly 

 absent. Towards the valley of the Kunhur coarse porphyritic gneis 

 comes in abundantly often forming considerable ridges. 



Traverses made southwards from the region above described to the 



Neturhat and Gulgul pats or plateaux did not 

 The pats. 



reveal the presence of any metamorphic rocks 

 meriting particular or special notice. It may be stated, however, that the 

 face of Neturhat on the north is principally formed of a massive felspathic 

 granite, in which foliation is either very obscure or wholly non-existent. 



Rocks referable to the sub-metamorphic series are not represented in 

 Sub-metamorphic se- *^^^ ^^®^^ ^^^ ^^1 ^ f^^ miles off to the south and 

 ries absent. south-west they are found in the neighbourhood 



of the Bisrampur coal field in the district of Sirguja. 



( 37 ) 



