444 THE GEOLOGY OF THE NEW HEBRIDES, 



Meli District. Above the 280 ft. level outcrops of coral lime- 

 stone were alone observed. 



There are two large caves on the island. One near the north- 

 east corner runs in the recent raised coral at an elevation of 



^1025ft. 



970ft _ 



MELI BAY 



— sea Level 



Horizontal Scale i ^ tnile.__ 



Fig. 6. Traverse across the Havannah Harbour plateau. 

 about 30 ft., penetrating for a distance of 120 yards, though only 

 quite narrow after the first 40 yards. Another in the south- 

 west corner excavated in the coarse pumice tuff is in the form of 

 a dome, 40 yards in diameter and quite 80 ft. high. It has a 

 small entrance 50 ft. above sea-level, and thus presents the 

 appearance of a huge bee-hive. It has no doubt been formed by 

 the sea eating away some soft bed below, causing the unsupported 

 tuff originally forming the interior of the dome to subside. 



Erradaka and Moso are similar, geologically, to Leleppa 

 Island, and with it are probably separated from the mainland 

 by a subsided area giving rise to Havannah Harbour. 



Undine Bay District. — Several excursions were made to the 

 hills in this vicinity, with results incorporated in the section 

 (text-fig. 7). The limestones of the two upper raised reefs are 

 quite similar to each other, and much older in appearance than 

 that composing the lower terraces. When making the ascent of 

 the highest hills along the track shown in the map, outcrops of 

 a similar limestone, much intruded by porphyritic basalt, (Sec. 3, §8) 

 were continually met with at intervals between the horizons of 

 the two older raised reefs. From this fact, and judging bj- the 

 contour of the land-surface in the vicinity, (Plate xiv.) it is 



