442 THE GEOLOGY OF THE NEW HEBRIDES, 



of 430 ft., then slopes away gradually to the south. The steep 

 northern face, we think, is due probably to a fault, though little 

 direct evidence of such is obtainable. The discovery of a few 

 derived pebbles of fine-grained tuffaceous rock at about 230 ft. 

 level indicates the proximity of underlying foundation-beds to 

 the surface. In the section several newer coral limestone growths 

 are indicated skirting the lower slopes. In all, three zones are 

 differentiated : — 



1. The old coral reef capping the hill and yielding — 



Corals — \, 4, 18. 



2. The foundation-beds of the old reef yielding — 



Pelecypoda—2, 10, 25. 

 Gastropoda — 9, 15. 

 Al^a — 1. 

 Corals— 2, 12, 14. 



3. The newer veneers at lower elevations yielding — 



Pelecypoda — 2 1,30. 

 Corals—^, 19. 



Meli District. — Extensive alluvial flats as much as two miles 

 in width are developed here. At the foot of the Tripple Top 

 Mountain in the bed of a river deeply scored in coarse pumice 

 tuffs, pebbles of glassy andesite were found, indicating proximity 

 to one of the old andesite vents; other pebbles, found to be 

 varieties of submarine tuff, were composed of fragments of 

 soapstone-like rock and organic remains, amongst which 

 Conocyathus sp., and Lima sp. were recognised. 



Havannah Harbour Tableland. — This we found to be one of 

 the most excellent examples of raised coral reef-formations 

 imaginable (Plate xix., fig. 1). A more complete examination 

 than we were able to carry out in our limited time, could be 

 readily accomplished, by working on the magnificent exposures 

 in the steep cliffs of the Ai Stream gorge, and should be of the 

 greatest interest. 



Several traverses were made in the most promising directions. 

 The first was up Steep Gully (Plate xxiv.) to the west of the Ai 



