30 FOYE. 



(3) A period of uplift followed, during which the submarine tuffs 

 and agglomerates were elevated over 2400 feet (Guppy, 1903, p. 154). 



(4) The succeeding period of erosion carved the uplifted volcanic 

 mass into a mature topography. 



(5) A period of submergence followed, during which coralliferous 

 limestones were deposited about the spur ends of the mature hills 

 along the coast. 



(6) A period of stability allowed wide valleys to be opened in 

 the interior. 



(7) A later uplift of 80 to 90 feet was followed by a short period of 

 stability during which a shore platform was wave-cut on the soft 

 limestones. 



(8) Renewed uplift of 40 to 50 feet allowed valleys to be carved 

 in the shore platform of (7). 



(9) A recent rise of the sea-level has filled the valleys of (8) with 

 volcanic silts. 



Northern Coast of Vanua Levu, East of Lambasa. 



A rapid trip of 30 miles was made by train, along the northeastern 

 coast of Vanua Levu, east of Lambasa. The rocks exposed are 

 rhyolitic ash and agglomerate. These have been maturely dissected 

 and wide valleys, extending far inland, are found at intervals of 5 to 

 7 miles along the shore. The coast is very irregular and typically 

 embayed. 



The history of this coast appears to be the same as that near Lam- 

 basa. During the period in which inland valleys were formed, wave 

 erosion cut into the rhyolitic deposits of many of the ^■olcanic cones 

 along the coast and formed sea-cliffs 300 to 400 feet in height. The 

 friable nature of the rhyolitic ash-beds allowed rapid cliffing. As the 

 cliffs retreated, certain craters seem to have been breached, so that 

 the ocean water entered their floors. The remnants of the crater 

 walls, forming islands and headlands about the bays, show quaqua- 

 versal dips. 



The floors of the wide valleys of this region stand at a less elevation 

 above the sea than those near Lambasa. Either the uplift, folhnving 

 erosion, was not as great towards the east or, it may be, the depression 

 following uplift was greater. The ocean is now attacking the shore 

 again and carving from the rhyolitic ash a series of undercut cliffs, 

 20 to 30 feet in height. 



