BY W. G. WOOLNOUGH. 463 



occur in a tuff below the main limburgite at Nadrau. Another 

 conglomerate occurs south of Nadraii, but does not contain 

 granite pebbles nor fossils. It is, however, probably the base of 

 the limburgite series. 



Passing eastwards, the solid rocks disappear, leaving onl}^ the 

 tuffaceous members of the series. 



The fault at Nadarivatu whose possible existence was suggested 

 in my former paper, does not exist. Hot springs occur near 

 Tavua, bearing out the suggestion that volcanic action has been 

 very recent in this part of the island. 



ix. — Muanivatu District. 



This district lies in the Sigatoka Valley, just about the junc- 

 tion of several large tributaries with the main stream. I have 

 taken the liberty of calling the district after the noble mountain 

 peak, over 4000 feet high, which is its most conspicuous feature. 



This area is of very great geological importance, on account of 

 the sections afforded of the older rocks, and the possibility that 

 some of these sections may show the relationship of these rocks 

 to fossiliferous formations. The district is well worthy of a 

 separate expedition. I was prevented from returning to it on 

 account of floods. Among the points of special geological 

 interest may be m.entioned the wide area of granite and associated 

 rocks of the Wailato, Waivou, Wainasa valleys; the slaty rocks 

 of Namoli"^' and the district immediately to the north, the hot 

 springs of Waibasaga, the granite-bearing agglomerates of 

 Nukuilau, the cave-limestones of Tawaleka, the level-bedded 

 soapstone of the higher parts of the district, and the magnificent 

 volcanic mass of Muanivatu itself. 



My former traverse indicated that no granitic rocks outcrop 

 in the valley of the main stream of the Sigatoka, though granitic 

 pebbles are abundant, particularly below Waibasaga. At this 

 town a large tributary, the Wailato, comes down from the east. 

 At a point only a mile or so above the junction, the granite is 



* Called Nalaba in my former paper. 

 35 



