474 A CONTRIBUTION TO THE GEOLOGY OF VITI LEVU, FIJI, 



EXPLANATION OF PLATES XL -XV. 



Plate xi. 

 <ieological Sketch Map of Viti Levu, Fiji. 



Plate xii. 

 Map of Viti Levu, Fiji. 



[iVo^e.~The gaps in the last two syllables of the name Wainikoroiluva 

 (just above the name Nabui) represent the missing letters l and v.] 



Plate xiii. 



j^igj. Korobasabasaga from the east. Nearly 4,000 feet above sea-level. 



Native name means "the mountain with the much divided 

 summit." It represents the denuded remnant of a line of volcanic 

 cones along a N.E. and S.W, axis. The summits consist of solid 

 necks of hornblende-andesite agglomerate, and were probably 

 amongst the earlier Cainozoic volcanoes. 



Pig. 2. — Voma, a volcanic peak at the head of the Waidina River. It is 

 composed essentially of hypersthene-andesite agglomerate, and is 

 probably amongst the latest of the Fijian volcanoes. 



Plate xiv. 



Fig. 1.— Nabui, another hypersthene-andesite peak on the Wainikoroiluva 

 River. It probably belongs to the same suite of eruptions as Voma, 

 and is later than Korobasabasaga, which lies a little to the north- 

 east. The precipitous fall in the picture is about 2,000 feet high, 

 and may be the direct result of faulting. 



Fig. 2. — Upper Waidina Valley, showing that the stream has in places passed 

 the period of extreme youth, though it is still quite young. The 

 forms of the mountains in the background strongly suggest block- 

 faulting. 



Plate XV. 



Figs. 1-2. — Sections of upraised (Tertiary) coral reef exposed in road-cutting 

 behind the hospital, Walu Bay, Suva. The " reef channels," 

 characteristic of present-day reefs, are filled in with "soapstone," 

 which also covers the limestone. Photographs by C. A. Holmes, 

 Esq., Suva. 



