-162 A CONTRIBUTION TO THE GEOLOGY OF VITI LEVU, FIJI, 



I revisited the locality, and searched it as well as very adverse 

 conditions would allow. Although no fossils better than those 

 before obtained were collected, 1113^ previous work is confirmed in 

 evei-y pai-ticular. It will be shown later (p. 468) that the granite 

 floor has been met with, in situ, at a point only a little to the 

 south of this, and can lie at only a very slight depth below the 

 NasocjO conglomerate which is, therefore, in all probability a 

 basal conglomerate. As it lies at an altitude of 790 feet above 

 sea-level, the uplift during Cainozoic time must have been at least 

 that amount. 



The level-bedded tuffs associated with the limburgite series 

 reach an elevation of over 4000 feet. From their great uni- 

 formity of composition and their persistence, they must certainly 

 be marine, for it does not seem j)ossible to obtain such 

 uniformity and level bedding in a subaerial formation. If this 

 is so, the elevation during Cainozoic time must have reached at 

 least 4000 feet. 



If the tuffs are marinse, then their associated flows must also 

 be submai'ine, and yet they extend with perfect uniformity over 

 very wide areas. The only very vesicular lavas met with are 

 north of XJdu, and north of Nagatagata on the Sigatoka. 



Another conglomerate, similar in many respects to that at 

 Nasoqo, occurs below the village of Dubuya south of Nadrau. 

 It does not seem to contain any fossils, and I found no pebbles 

 other than andesitic ones in it. It is, however, related to the 

 older rocks below Waisa, 



Summary of Section viii. — The rocks of this district 

 are essentially level-bedded soapstones, with intercalated limbur- 

 gites. These are all certainly of marine origin, and, since they 

 rise to over 4000 feet above sea-level, point to an uplift of at least 

 that amount in Cainozoic time. A basal conglomerate containing 

 granite pebbles and resting on a floor of granitic rocks (exposed 

 a little distance to the south) is met with at Nasoqo on the 

 Wailoa. In it occur marine shells, including Conus. These are 

 too poorly preserved for specific determination, but are certainly 

 Cainozoic. Shells {Pecten, etc.) and corals (Goiiiophyllum) also 



