REPORT ON MATERIALS FROM TFIE BORlNdS AT FUNAFUTI ATOLL. 247 



Depth from Surface, 7 Sl-7 90 feet ; Distance Bored, 9 feet; Total Length of Core 

 Ohtained, 7 feet 10 inches; Numbers of Cores, 97a-I22a. 



The cores are cylindrical ; they consist of whitish-grey, mottled with white, and 

 occasionally speckled, undulating layers of dolomitic rock, generally similar to the 

 preceding. The rock is hard, it can be scratched with a knife, but not readily, 

 (H = 4) ; is generally compact, but with occasional cavities and small hollows. The 

 whitish banded portions, for the most part of encrusting Folytremct and Lithotham- 

 nion, are of a softer character than the grey portions of the rock. The cores are 

 formed mainly of casts of corals and foraminifera, with fine detrital materials. The 

 corals are more numerous than in the preceding cores ; in some cases they are 

 estimated to form one-third to one-half the rock. They principally belong to 

 Pocillopora, Coeloria, Astrcea, Goniastrcea, Madrejjora, Astrceopora, and Porites. 

 The corals are, in part, replaced by crystalline dolomite, and their interstices 

 infilled by fine consolidated sediment ; often, however, the original structure has 

 been removed, and the spaces are now empty. Some of the corals appear to be in 

 their position of growth. For the most part they are small forms. 



The larger part of the rock still consists of foraminifera and detritus cemented by 

 crystalline dolomite. The foraminifera include Orhitolites, Textularia, Placopsilina, 

 Carpenteria, Calcai'ina, Gypsina, Polytr&ma, Amphistegina, and Heterostegina. 

 Carpenteria occurs in patches. The walls are removed, and only their casts traversed 

 by the infilled canals remain ; Polytrema plamvm is a very prominent feature of the 

 rock. Alcyonarian spicules are of common occurrence, and one specimen of 

 Lohophytum was noticed. Serpida-tuhes,. Halimeda, fairly preserved, and Litho- 

 iham.nion. The consolidated detrital materials and fine sediment, as seen in 

 microscopic sections, consist of broken-up foraminifera, and fragments of Lithotham- 

 nion, with other minute particles of organisms, which cannot be determined. 



Details. 



(97a, 98a). Total length 186 millims. Whitish-grey, hard, compact, dolomite, with cavities. Casts of 

 small forms of Madrepora and Pontes (f). Greater part of the core consists of foraminifera and detrital 

 materials, Aiiqjhistegina, very numerous. Pnlytreum. Se'qnda. Casts of lamellibranchs. 



(99a, 100a). Total length 187 millims. Whitish-grey, hard, generally compact and dense. Some 

 porous areas and small cavities. Several casts of Madrepora and other perforate corals, altered beyond 

 recognition ; these serve as the nuclei of Polytrema and Lithothamnion, which encrust them with white 

 concentric layers. Somewhat more than half the core consists of foraminifera and minute fragments 

 cemented by dolomite. Casts of gastropods. 



(101a) [710]. Length 113 millims. Greyish-white, mottled and speckled, partly compact, partly porous. 

 Lower part of core entirely of cast of Pmites, of. P. arenosa, Esper, sp. Coral structure replaced liy 

 crystalline dolomite, and the interstices infilled with the same in part, and in part empty. The 

 foraminifera include Orhitolites, Textularia, Calcarina, Polytrema, Amplmtegina and Heterostegina. Alcyonarian 

 spicules; groups of Serpnda-iv^ye^. Halimeda, showing structure. Fragments of Lithothamnion in the 

 detrital materials. 



(102a) [711, 712], Length 111 millims. Banded white and grey, hard and dense rock. Casta of 



