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



Fossiliferous limestones of Middle Tertiary Age were met with 

 at Walu Bay, Suva, and at Tawaleka, Sigatoka River. An 

 immense mass of dense white limestone occurs at Naqalimare, on 

 the Sigatoka, but has yielded no fossils. 



The volcanic rocks were divided into a southern andesitic series 

 and a northern basaltic series, each associated with tuffs and 

 agglomerates, and giving rise to extremely rugged mountainous 

 country. 



The "soapstone" is an almost ubiquitous rock. As its name 

 implies, it is a fine-grained, unctuous roek. It is stratified, the 

 bedding generally being nearly or quite horizontal. I believe it 

 to be a redistributed volcanic tuff deposited under marine con- 

 ditions. At Nasoqo it has yielded marine fossils and waterworn 

 boulders of granite, and at Nadrau marine fossils. The former 

 place stands at an altitude of over 800 feet above sea-level, and 

 the latter place at over 1200 feet, so that we have evidence of 

 elevation of the land to the extent of at least 1200 feet during 

 Cainozoic time. 



I failed to find any conclusive evidence of folding or faulting 

 connected with the movements which, I assumed, had isolated 

 Fiji from the continental areas to the west, but thought that 

 there was possible evidence of a fault at Nadarivatu. 



Geological Observations. — Plan of subdivision. 



For convenience I shall divide the area examined into several 

 geographical districts, and describe these in order. These 

 districts are indicated by numerals on the sketch plan (fig.l). 



It must be understood that this division is one of convenience 

 only and has nothing whatever to do with the official partition of 

 the island into provinces and districts. 



i. — Rewa District (includi7ig the Lovjer Waini^nala, Waidina, and 

 Waimanu Rivers). 

 The Rewa Delta and the lower Wainimala were described to 

 some extent in my former paper. At the upper end of the 

 steamer channel through the mangrove belt of the delta, Avhere 

 the channel joins the main river, it was noticed that a bar of 

 reef limestone was being blown up to deepen the channel. I 



