466 THK CONTINENTAL ORKilN OF FIJI, 



jointed tuffs, up to four or five inches in length. The granite 

 and jointed tuffs, which I beHeve to be very ancient, make up 

 about one-third of the gravel. All the stones are thoroughly 

 rounded. From this fact, as well as from their comparatively 

 small size. I judge that they must have been transported a con- 

 siderable distance, so that the outcrops must be a long way up 

 stream. I think the course of the Wainivalau is shown incorrectly 

 on the map. It certainly flows to the east of the mountains of 

 the Buki Levu group, and from its volume at Nadakuni, must 

 have a considerable extension above this point. 



Viewed across a deep valley from the mountain Narpiyawa, 

 and distant from it about two miles, Buki Levu is seen by means 

 of field glasses to be composed ver}^ largely of agglomerates 

 similar to that mentioned above. If there is any tendency to dip 

 it is westwards. The slope of the mountain is highly suggestive 

 of a volcanic neck. Its summit is about 3000 feet above sea- 

 level. Behind — that is, to the north of Buki Levu — there are 

 three well-marked ridges running, like it, about east and west. 

 The middle one of these, Kororagigi, is distinctly razor-backed, 

 and may represent a huge dyke. Kavu Kavu, distant about 12 

 or 14 miles, shows a solid outcrop near its western extremity. 

 The rule was found to be of almost universal application through- 

 out the expedition, that all cliffs are composed of agglomerate. 

 Of course at the distance of Kavu Kavu it w^as impossible to 

 make out details, but the outcrop w^as probabl}' agglomerate. 



The high hills are densely timbered, the foliage being of a dark 

 green colour. The low tuff ridges are covered with lower vegeta- 

 tion, largely " reeds," which give the foliage a lighter and more 

 yellowish tint. This fact, as well as the characteristic outlines, 

 distinguishes the two formations even at considerable distances. 

 The photograph (Plate xxiv., fig. 5) brings out the distinctions 

 fairly well. In it Kororagigi and Kavu Kavu are almost com- 

 pletely hidden by mist and cloud. 



In some of the creeks several miles to the south and east of 

 the high hills the tuffs are bedded and sandy, and dip east at 15°, 

 i.e., away from the mountains. 



