REPOET ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 255 



The matrix is a fine-grained dolomite with numerous hollows which are lined l)y crystals with a light 

 brow^nish exterior banding. Orbifolites, other foraminifera as in the preceding. 



(186a). Length 113 niillims. Glreyish-white, hard, generally compact, wdth a few cavities. Casts 

 of an Astrgean, Madrcpora, and Pontes. Aniphideyina. 



Depth from Siirface, 815-822 feet; Distance Bored, 7 feet; Total Length of Core 

 Obtained, i: feet 5 inches ; Numbers of Cores, 187a-197a. 



Cores cylindrical, whitish-grey, generally hard dolomitic rock, like the preceding. 



Mostly compact, with occasional cavities. In some of the lower cores, a change 



has taken place in the whitish portion of the rock, which has become much 



softer, whilst the bro^\aiish portion in contact with it retains its hardness. 



Casts of small Astrsean and perforate corals are scattered in the cores, but they are so 



dolomitised that they can hardly be recognised, and they are fewer in proportion to 



the foraminiferal and detrital contents of the core than in the preceding cores. 



Mctdrepora and Astrceoporcc can be distinguished, and also a small specimen ot 



MiUepora. Foraminifera are numerous, but beyond Polytrema and Amphistegina they 



can only be seen in microscopic sections. Casts of gastropods and lamellibranchs, 



Serpula. 



Details. 



(187a) [736]. Length 131 millims. Whitish-grey, mostly compact, hard, with occasional hollows. 

 Casts of Astra'opom, replaced by dolomite, also a small MiUepora (shown in microscopic section). Greater 

 part of core consists of defcrital materials with foraminifera. OrbitoUtes, Planwhilina, Polytrema planum, 

 Amphistegina, Heterostegina. Alcyonarian spicules ; echinid spines. Casts of gastropods. 



(188a). Length 180 millims. Mottled whitish-grey, hard, mostly compact with a few small cavities. 

 Casts of small corals fairly numerous. Astrcea, Madrepara, and others not determinable. The corals 

 encrusted by Polytrema and Lithothamnion. Amphistegina. Casts of gastropods and lamellibranchs, Serpula. 



(189a). Length 200 millims. Whitish-grey, hard, mostly compact. A few small casts of Madrepara 

 enclosed hy Polytrema ptlanum. The greater part of core consists of fine detrital materials with foraminifera, 

 scarcely any beyond Amphistegina distinguishable with a lens. Echinid spines. Casts of gastropods. 



190a. Length 105 millims. Rock similar to preceding. Casts of Madrepm-a. Amphistegina. Echinid 

 spines. 



(191a). Length 102 millims. Greyish-white, hard dolomite. Core broken up into several pieces. Casts 

 of small corals, characters obliterated. 



(192a, 193a). Total length 240 millims. Whitish-grey, hard dolomite, fairly compact, with irregular 

 hollows. Casts of undeterminable corals. Polytrema, Amphistegina. Echinid spines, Lithotlmmnion. 



(194a). Length 101 millims. Grey and white rock intermingled, the white softer and more porous. 

 Mainly foraminiferal and detrital. Foraminifera numerous. A very rotund form of Amphistegina occurs 

 here and in some of the preceding cores. Large echinid spines, well preserved, some showing a 

 brownish tint. 



(195a, 196a). Total length 181 millims. Like preceding, grey and white areas intermingled, some of 

 the latter sufficiently soft to be scratched by nail. Contents of cores same as preceding. 



(197a) [737]. Length 84 millims. White and greyish areas as in preceding, the greyish, a hard crystalline 

 dolomite replacing coral, the white portion consists mainly of the foraminiferal and fine detrital material, 

 and is comparatively soft. Cast of perforate coral, not determinable, encrusted by Polytrema planum. 

 Globigerina, Carpenteria, Planorbulina, P. miniaceum, and Amphistegina. Large, well preserved echinid spines. 

 Pores lined by rhombohedral crystals of dolomite. 



