476 THE GEOLOGY OF THE NEW HEBRIDES, 



Firstly, in regions of continuous iij^heaval^ islands are veneered 

 with coralliferous limestone terraces, e.g., The New Hebrides. 



Secondly, islands situated on subsiding areas are typically 

 atolls, e.g., The Ellice Group. ^' 



The third type of island, is one in which coralliferous limestone 

 is found interbedded with submarine tuffs or other material, 

 being evidence both of upheaval and subsidence; such areas are, 

 as a rule, larger land-masses, e.g., Viti Levu,t and have been 

 affected by oscillatory movements of the earth's crust, and not by 

 folding of the acute type defining most of the South Sea Island 

 ridges. 



The most promising field for future work, extending these 

 observations on Pacific tectology, is undoubtedly South-Eastern, 

 New Guinea and the neighbouring islands, where it is hoped 

 that shortly further investigations may be prosecuted. 



The author wishes to express his great indebtedness to Capt. 

 E. G. Rason, R.N., British Resident Deputy Commissioner in 

 the Group, for help afforded and considerable trouble taken to 

 ensure as thorough an examination of the Group as circumstances 

 would permit of. 



To Professor T. W. E. David, B.A., F.G.S., F.R.S., we have 

 been in a chronic state of indebtedness for much assistance 

 rendered ever since his first suggestion of the undertaking. 



Our thanks are also due to the following gentlemen : — Com- 

 mander J. P. Rolleston of H.M.S. "Archer" for cordial assist- 

 ance in extending our field operations; Professor A. Liversidge, 

 M.A., LL.D., F.R.S., and Acting Professor J. A. Schofield, 

 A.R.S.M., F.C.S., for facilities offered the conduct of the 

 research;! Messrs. W. S. Dun and C. Hedley, F.L.S., for advice 

 in publication. 



* '' The Atoll of Funafuti," Lond. 1904. 



+ Woolnough, W. G., "The Continental Origin of Fiji," Plate xxii., 

 fig.l. 



+ The several rock-analyses undertaken were conducted in the chemical 

 laboratory during the author's term of Junior Demonstratorship. 



