REPORT ON MATERIALS FROM THE R0RIN(4S AT FUNAFUTI ATOEE. VJ7 



Details. 



(12). Length 55 millims. A rioduluv rock with cavernous liollows, consisting of a clump of FucUlojjuru. 

 The corallites arc for the most part filled up solid ; the coral has liecri extensively tunnelled by l)oring 

 oi'ganisnis ; some of the borings remain empty, others are infilled by fine detrital mud, now consolidated 

 into hard rock. Folyfremu vnnian'niii, Lithothainnion, with embedded orange-tinted tubes of SerpuJa. 



(13) [506, 507, 608, 609]. Length 110 millims., diameter 100 millims. Cylindrical core nearly all of 

 Madrepora contecfa, the corallites of the branches and some of the coenenchyma filled in with fine 

 sediment, or with fibrous crystals of " conchite " or aragonite ; other portions of the coenenchyma remain 

 empty. Heliopora ccmileu, fragment. Foli/trema miniaceum. Lithuthamnion. 



(14). About thirty irregular nodular fragments of hard, grey rock, worn by drill, the largest piece 

 50 millims., diameter 60 millims. Principally of corals : Heliopom ccendea, Pocillipora sp. with encrusting 

 Lithothainnion. 



(15, 156/.S.). Length 205 millims., diameter 103 millims. Core cylindrical, for the most part a 

 solid, compact, hard, mottled rock consisting of Heliopora ocendea, Pontes (?), and Lithothamnion. Inter- 

 mediate areas are filled in with fine detrital sediment containing Polytreiaa miniaceum, numerous echinid 

 spines, some of large size and of purple colour, and tubes of Serpida.. The sediment is now, for the most 

 part, a hard rock, but in places it remains incoherent and powdery. Professor David considei's that this 

 core is part of a coral reef platform formed at low-water level. 



(16) [610]. Nodular fragments (22) of hard cavernous rock, principally of HeKopora ccendea, 3Iadrepoi-a, 

 encrusting Polytreina planum, and Lithothamnion. P. miniaceum and Carpenteria also present. Largest 

 fragment 50 millims. long by 65 millims. wide. 



(17, 18). Length 275 millims., diameter 103 millims. Cores cylindrical, largely of branching Litho- 

 thamnion; the interspaces of fragmental materials and fine sediment, partly hardened into firm rock, 

 partly as loose chalky powder. Orhitolites, Polytrema miniacemn, echinid spines, gastropod shells, small 

 coprolitic pellets, orange-tinted tubes of Serpida. 



Depth from Surface, 20-30 feet; Distance Bored, 10 feet; Toted Length of Core 

 Obtained, ^ feet 4 inches; Numbers of Cores, 19-33. 



Whitish-grey, hard, cavernous limestone, mainly of thick plates of Heliopora, and 

 undetermined perforate corals, with branching nodular and encrusting Lithothamnion, 

 supplemented by the encrusting Polytrema planum. Interspaces betv^^een the corals 

 are sometimes vacant, but more frequently filled v^dth detrital calcareous mud, either 

 consolidated into hard rock, or occasionally as an incoherent chalky pow^der. I'he 

 foraminifera in this sediment include Orbitolites, Placopsilina, Globigerina (rarely) 

 and Polytrema miniaceum. Other organisms present are detached stellate spicules 

 oi Leptoclinum, echinid spines, Serpula, gastropod shells, and, rarely, detached joints 

 of Halimeda. Professor David states that these cores certainly represent reef rock. 



Details. 



(19). Length 100 millims. Rounded core, principally of branching and encrusting Lithothamnion with 

 some small pieces of Heliopora ccendea, now in part bleached to a greyish tint. Irregularly laminated 

 growths of an undetermined coral or hydrocoralline. Rock verj' cavernous, some of the vacant spaces may 



