GEOLOGICAL OBSERVATIONS IN FIJI. 



15 



It is true that the western eoast of the hirge ishind is deeply embayed, 

 but there has been uphft along this coast since the embajraent. The 

 Nandi River, for example, has a wide, alluvial valley extending for 8 

 miles inland. Near its mouth, residual hills rise GO to 75 feet above 

 the general level of the plain. Some of these hills are composed of a 

 red clay, the lateritized product of andesitic rocks. Other hills are 

 made of loose river gravels which unconformably overlie the volcanic 



Figure 3. Geological Sketch Map of Southwestern Viti Levii. 



rocks and must have been uplifted recently. Again, masses of up- 

 lifted coral limestone exist at the northwestern side of the lagoon, 

 among the Yasawa islands. The positions of the masses cannot be 

 accounted for by a single tilting movement. 



A study of the recently established shore-line of southwestern 

 Viti Levu and the older, eroded topography of the limestones of the 



