BY D. MAWSON. 



445 



probable that an extensive fault^ has been developed along the 

 face of what are now the highest hills, letting down the north 



side. 



On this assumption, the lower development of older raised coral 

 limestone would not be a separate horizon, but merely a subsided 

 portion of that outcropping abo^'e. 



Coral limestone,! 

 about 40ft 



Fig. 7. Section through the hills south of Undine Bay, Efat6. 

 Contemporaneous with this faulting would be lava-intrusions 

 and the extrusion of volcanic material in the vicinity of Fatmalapa. 



* This fault seems to have crossed the older crater which had Prided the 

 agglomerate beds. Its direction, traced by the topography of the hills, seems 

 to have been peripheral, with Nguna as centre. 



