NOTES EXPLANATORY OF LETTERING ON THE GEOLOGICAL MAPS. 121 



T. Swampy, part has apparently at some time been cultivated. 



U. Darker sandy soil about 2 feet 6 inches above high water. 



V. Small Hcliopora swamp, exhibiting the radiating lines of Heliopora standing above the surface and 

 undergoing decomposition into a whitish and very stick}'' mud ; some of the upstanding exposed edges 

 had become so far decomposed that a little pressure between the fingers was sufficient to reduce them to 

 fine mud. This is the only species of coral I observed that underwent this kind of decomposition on direct 

 exposure to atmospheric influence and rain. The tips of the rays were about level with high water. 



W. Line of greatest solution, cavernous. Breccia sheet and coral blocks undergoing solution. 



A^. Western edge of Taro cultivation. 



B^. Southern edge of main cultivation, plantations of brokka and banana trees. 



J\ Native track to " Look-out." 



K^. Flat mass of coral 9 feet by 6 feet, solidly embedded on the top of breccia. Lying within 6 feet of 

 top of Hurricane Beach. 



M^. On the coral platform here clumps of nullipore thrive around the lips near the ends of the longest 

 water channels fully 2 feet above low tide, e.g., the ends of the bores, where they are bathed by the welling 

 up of water or intermittent spray, when not covered by a sheet of water. Some of the spray rises 

 geyser-like 18 to 20 feet above the platform. 



N^. This is a very exposed part of the coast, and seems to receive the full strength of the weather. 

 The wash must be great, judging from its eroding and corroding effects on the breccia near the beach. 



P^. Mangrove fringe. 



Qi. Hurricane Beach rather low and very narrow. No cocoanut trees. 



S^. Flattish mass of breccia sheet 5 feet by 3J feet, apparently hurled on top of Hurricane Beach. 



T^. Track from beach to swamp, and swallow-hole. 



V^. Heliopora ccerulea on dead reef with Pontes. 



W^. Old shingle bank, probably drifted from swamp. 



Y^. The fragments of shingle about here are 1 to 2 inches in diameter ; a few aroids grow close by 

 here. 



A^. Probable approximate line of breccia below surface. 



B^. "Well water-worn stones. Storm beach narrow. No Hurricane Bank. 



D^. (Two places.) Between the surfaces of dense rock 0. 3, forming the floor of much of this swamp, 

 are numerous hollows a yard or two in diameter filled to the surface with mud and sand, and below this, 

 Heliopora (in situ) and foraminiferal sand. (Sample No. F.H.iq.) 



E^. (Two places.) Site in the floor of i\Iangrove Swamp where the coarser sand brought up from 

 between the small elevations of dense fragmental rock (breccia floor) by crabs, molluscs, &c., was taken. 

 (Sample F.H.o.) 



F^. Rock of coral and nullipore breccia forming dense floor of large part of IMangrove Swamp which 

 has been laid down over and between the Heliopora reef, now forming and capping over same in some places, 

 as at 0.3. (Sample No. F.H.3.) 



G^. (Three places.) Slightly coherent foraminiferal sand forms the covering to this part of floor of 

 swamp, on its south and S.W. sides, covering the Heliopora ccerulea which is below it. (Sample 

 No. F.H4.) 



H^. (Five places tried.) Heliopora under the sand and jelly-like mud covering between the dense 

 rock of coral and nullipore breccia in floor of swamp. (Sample No. F.Hs.) 



J2. (Five places tried.) Heliopora with filling of sand and nullipore under the consolidated breccia 

 capping in swamp. (Sample No. F.H9.) 



K'^. (Two places.) Consolidated sand capping at S.W. part of Mangrove Swamp, containing Tinopwus 

 Orhitolites, shells, &c. (Sample No. F.H.7.) 



L^. (Two places.) Long frayed-like ends of robust Heliopora project out on the rising floor, in nearer 

 parts where it is covered with the breccia cap which is above it, but farther in under the Hurricane Bank. 



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