SEC. 2.] RUNN-ISLAND RANGE FROM PUTCHUM TO CHORAR. 117 



the surface. Whence they have heen derived originally is a matter of 

 much uncertainty^ the agate-containing traps not being present^ but 

 they have been found in situ in some places in the lateritic beds, and are 

 very numerous in those already mentioned as exhibiting three kinds of 

 lateritic structure south-west of Bela. 



The alluvium of Bela is similar to that of Kurreer^ and has no very 

 marked peculiarity worth further notice. 



Choear. . 



The continuation of the Runn Island range terminates eastward 

 in Chorar, forming some hilly ground at the north side of the island, of 

 no great elevation, perhaps not exceeding 150 feet. 



Calcareous and shaly marine fossiliferous rocks with massive and 

 Northern and western ^^ggy tough sandstones of the Bela type occupy 

 parts of hiUs. ^jjg ^^^^^]^ j^^^j western portions of the hills. The 



corals of the range seem here to reach their greatest development. Many 

 were found weathered out on the top of the hills, but were usually so 

 crystalline as to have almost lost their structure. Some dark red or pur- 

 ple bands are full of fragmentary shells, and from lower beds were ob- 

 tained Uhynclionella, Peden, or Radida, Ostrea, spines and plates of 

 Mchinodermata, segments of crinoid stems, &e., and, near the villao-e of 

 Eyware, a baud crowded with Corhida. 



The beds are contorted in places, but on the south side of the hills 

 southerly dips predominate, and numerous intrusions and dykes of basal- 

 tic gray and purple trap occur. 



Near the village of Charunka soft eonglomeritic sandstone and 

 shaly beds contain large blocks of fossil wood, one broken log of which 

 measured 25 feet in length. 



On the southern and eastern sides of the hills lateritic ground pre- 

 vails, one hillock, 50 feet high, being entirely composed of laterite and 

 black ferruginous sandstone. 



( 117 ) 



