BY W. G. WOOLNOUGH. 453 



of which Nalumu and Nabui are two''' of tho most prominent 

 peaks. 



Reasons have already been advanced for supposing this scarp 

 to have originated in late geological time through faulting. 

 Additional evidence of the same fact is not wanting. Almost 

 as soon as the hill country is entered, in the journey up the 

 Wainikoroiluva, that is, below Naqarawai, ancient-looking tuffs 

 are encountered, and a few miles further on quartz diorites in 

 situ. The " soapstones " to the west of the range are exactly 

 similar to those of the Rewa Plateau, and, like them, are on the 

 whole horizontally bedded. Close to the range the dips depart 

 from the horizontal. Below Laselase the rocks (andesites) in 

 the bed of the Wainikoroiluva are strongly jointed, indicating 

 powerful earth-movement, and the axis of these joints is S.S.E.- 

 N.N.W. 



The upper portion of the Wainikoroiluva is the only part which 

 I have examined in detail, and this has already been described.! 

 Further examination, on my second expedition, confirms my first 

 impressions as to the comparatively great antiquity of the jointed 

 rocks below Naqarawai. It appears quite certain that there is 

 strong nonconformity between these rocks and the level-bedded 

 soapstones which overlie them. Unfortunately no new section 

 was discovered which throws any important light on the all 

 important question of the relation between the jointed rocks and 

 the quartz diorite immediately to the north. 



A considerable extension of the granitic and slaty rocks to the 

 westward is proved by the discovery of well-worn pebbles of such 

 rocks in the Wainimokuta, a large stream entering the Waini- 



* The Admiralty chart shows only one very high peak here, and my 

 endeavours to fit in the results of my own magnetic bearings lead me to 

 suspect that Nalumu and Nabui are possibly the names of opposite slopes of 

 the same mountain. The Fijians are very poor geographers, with very little 

 conception of direction and distance, and get hopelessly "bushed" when 

 taken out of their own districts. 



t Former paper, p.47'2. 



