Sec. 11.] DETAILED DESCEIPTIONS. 171 



the traps, although the band in question is some distance above the 



base of the series ; and as the only rocks seen below 

 Direction whence j_i , , ,i 



detritus was probably the traps to the south are sandstones, it is probable 

 dcrivGd 



that the detritus in this and other instances was 



derived from the north. The quartzite and slate fragments must also, 



in all probabilityj have been derived from that direction, from the 



neighbourhood of Jumbooghora and Champaneer. 



The neighbourhood of Matapenai (or Kurah) hill is of considerable 



interest. The hill itself is a Craggy peak, of a highly 

 Matapenai hill. _ _ ooj r 3 o j 



crystalline, greyish trachyte, having somewhat the 

 appearance of a felstone, and composed, mainly, to all appearance, of felspar, 

 with interspersed augite. Scattered throughout the mass are huge blocks 

 of granite ; these, towards the top of the hill, are so abundant that it 

 might easily be supposed that the metamorphics cropped out there. 

 Many of these blocks are of great size ; some almost form small hills by 

 themselves; one mass on the south side of Matapenai is peculiarly 

 conspicuous. To the east the hill ends abruptly, metamorphics occurring 

 at the foot and extending to the north. To the west a long spur ex- 

 tends, composed of interstratifications of very hard ash breccia and of 

 ordinary basaltic flows. 



In the section exposed in the Hiran stream, north-east of the hill. 



Section in Hiran metamorphic rocks extend for a considerable dis- 

 **'^®^™- tance. In this direction also, the trap, near the 



village of Sodawud, contains fragments of granite, some of them of great 

 size, and in one place, on the south bank of the Hiran, a small clyhe of 

 granite is seen intersecting the trap. It is fine grained, and contains very 



Dyke of granite in ^"^^ plates of black mica ; the breadth is about 

 ^'^^P* 15 inches, and the dyke can be traced for about 



6 yards, while small veins, \ inch to an inch broad, are given ofi" from 

 it and ramify through the trap. Small fragments of trap are contained 

 in the granite dyke. 



( 333 ) 



