GEOLOGICAL OBSERVATIONS IN FIJI. 35 



agglomerates and flows. Near the suininits of the residual hills, 

 carved from the high-level plateau of the interior, shcll-hcariiig tiilTs, 

 interhedded with agglomerates, were found. 



There is but one large river flowing into Savu Savu Bay. This 

 river flows from the north and enters the north-central portion of the 

 bay. A few small streams drain the seaward slopes of the ridges, but 

 by far the greater part of the run-oflf from the back country is carried 

 by a series of subsec^uent streams into the througii-going river. The 

 mouth of the river has flood-plain deposits 4 or 5 miles inland. The 

 tide rises and falls in a tidal estuary, immediately above which the 

 flood-plain deposits cease and the river becomes a narrow torrential 

 stream wdth a boulder stream bed. There has been a recent sub- 

 mergence of the river's mouth. 



Guppy, (1903, p. 182) reports gabbros on the divide between Savu 

 Savu and Natewa Bays. These rocks were not seen by the writer. 

 Their presence indicates at least some similarity in the history of 

 the southern part of the island to that about Lambasa. In both 

 districts, hot springs with temperatures near the boiling point suggests 

 that the areas are now in the expiring stages of volcanic activity. 



The most interesting area in the Savu Savu Bay district lies along 

 the sea-coast, east of the eastern 

 bayhead. The present fringing 

 reef seaward from this bayhead 

 is nearly a mile in width. At 

 the western end of the reef there 

 is a small island of elevated coral- 

 liferous limestone of lagoon ori- 

 gin. This limestone is lacking 



for two or three miles eastward „ , - ^tj i • i 



„ 1 1 11 1 1 1 Figure 15. NdeJa-ni-koro, near 



from the headland, and a sandy Nandi, Vanua Levu. 

 plain extends a quarter of a mile White — volcanic rock. Black — 



inland to the late-mature, ande- ^^^^^^^^ "^'^^ "^^f- 

 sitic hills forming the center of 



the peninsula. Two and a half miles east of the headland and about 

 200 yards inland, a rise of land called Ndela-ni-koro, is formed of coral- 

 liferous limestone overlying a late mature topography of andesite, 

 (Figure 15). The hill is between 110 and 120 feet high. From this 

 point to the village of Nandi, 5 miles east of the bayhead, the tips of 

 the promontories are covered with elevated coralliferous limestone. 

 At Nandi, the eroded andesites were once depressed below the sea, 

 covered unconformably with lava flows which were conformably over- 



