16 



FOYE. 



Yasawa group and eastern Viti Levu, near Suva, has led the writer 

 to postulate the following history for Malolo lagoon and reef. 



1. The lagoon was initiated by the extensive submergence of Viti 

 Levu during the period in which the coastal-plain sediments were 

 deposited. The sediments formed a wide submarine flat about the 

 older, folded mass of the island. 



Figure 4. Structural Dii)s in Southwestern Viti Levu. 



2. The western portion of the fiat was then warped in such a way 

 that the Yasawa limestone was raised above the sea, forming the 

 western side of a trough. The western rivers of Viti Levu, draining 

 into the eastern side of the trough, were drowned by local subsidence 

 and a contemporaneous upwarp caused tiie emergence of the coastal 

 series at the eastern side of the island, near Suva. 



'.i. \ period of erosion followed, after which volcanoes developed 



