58 



FOYE. 



Coral heads in place appear from top to bottom of the 590 feet of 

 limestone; and in such relations that subsidence is the most logical 

 explanation of their position. However, the greater part of the 

 limestone is coral and shell rubble which surrounds occasional coral 

 heads. 



The depth of the lagoon about Tuvutha is 6 to 8 fathoms, much 

 less than the average depths of the lagoons of the Exploring group. 

 As compared with the Exploring group, only a relatively small 

 amount of upraised limestone has disappeared from the island. 

 These facts suggest a more recent date for the uplift of Tuvutha. 



Lakeviba (Figure 26). 



Lakemba differs from the islands just described, in that the andesite 

 forming its center was probably never overlain by limestone. The 

 volcanic surface, reaching a maximum elevation of nearly 800 feet. 



LEGEND 

 Block - L/meslone 

 Vvnite - AndesiTc 

 Lined -Coosfol Flot 



LAKEMBA 



Figure 26. Sketch Map of Lakemba. 



is composed of well-rounded, mature forms. The rocks are deeply 

 lateritized and support a scanty vegetation. The only fertile spots 

 on the island are found along the lower portions of the stream courses, 

 whither the best of the soil from the volcanic hills has been transported ; 

 or at the heads of the bays, where the coral sands produce an abundant 

 coconut harvest. 



