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



The former has ah-eady been described. 



North-west of Rewasau the surface of the plateau consists of 

 a veritable " clinker field " of very basic lava. This rests on a 

 series of several hundred feet of level-bedded soapstones. Then 

 comes a thick and very massive agglomerate or conglomerate bed 

 resting directly upon an irregidar surface of granite. This is the 

 only place, so far as I know, where the actual junction-line can 

 be seen between the conglomerates at the base of the soapstone 

 series and the pavement rocks. This point is within two or three 

 miles of Nasoqo, where the granite-bearing fossiliferous con- 

 glomerate occurs, but at the latter place the pavement rocks are 

 not exposed. The Bualevu conglomerate of the Sigatoka under- 

 lies the fossiliferous tuifs and basic lavas of Nadrau in almost 

 identically the same way as the similar formation under considera- 

 tion. At Bualevu the conglomerates are not far removed from 

 the jointed tuffs of Waisa, which may have formed their surface 

 of accumulation, but no junction-line is seen. 



Between Rewasau and Nadrau the greater part of the track 

 crosses level-bedded soapstones. In several places, however, 

 there are exposures of considerable extent of andesitic rock. 

 There are also patches of much-jointed rock which may represent 

 inliers of the older series. 



Summary of Section x i. — The chief point of interest 

 in this district is the highly interesting and important section at 

 Rewasau, showing a coarse conglomerate resting on the denuded 

 surface of a mass of granite. This is certainly the same forma- 

 tion as has been met with at Nasoqo and is in all probability 

 continuous with a similar conglomerate at Bualevu on the 

 Sigatoka. Both the latter occurrences have Tertiary fossils 

 associated with them. 



General Summary of Results. 



The greater portion of the island of Viti Levu is covered by a 

 thick series of level-bedded " soapstones," which I believe to be 

 marine redistributed tuffs. In places, as in the Nadarivatu 

 District, thick flows of limburoitic lava are interbedded with the 



