EEPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 229 



From 589 feet came various samples of crushed rock ; medium coarse angular fragments of white rock, 

 with Amphiskgina, Heteimtegiim, alcyonarian spicules and fragments of polyzoa. 



From 594,595 feet, the mateiials fine, only small iovmHoi Amplmtegina. The foraminifera in the crushed 

 rock have roughened surfaces, they have evidently l>een set free by the mechanical breaking up of the rock 

 by the drill. 



Deptlh from Surface, 598-612 /ee^ ; Distance Bored^ 14, feet; Total Length of Core 

 Obtained, 10 inches : Numbers of Cores, 305, 306. 



The solid cores include two cylindrical pieces and a number of irregular fragments 

 of greyish-white, moderately hard porous limestone, generally similar to the preceding. 

 There are two or three small Astrsean corals, which may perhaps be AstrcBa lobata. 

 These corals are in part replaced by calcite, which also infills their interstices. The 

 larger part of the cores is of fragmental materials with numerous foraminifera. Some 

 of the slit-like jDores in the rock appear to be casts of Halimeda-'^ovais. The 

 loose materials brought to the surface by the sand-pump consist of angular fragments 

 of the same kind of the rock as the cores ; in microscopic sections they show similar 

 foraminifera in consolidated sediment with occasional pieces of coral casts. 



Details. 



(305). A single piece of cylindrical core and numerous irregular fragments of moderately hard, porous, 

 rubbly rock, having altogether a length of 194 millims. Pieces of Astrcea lohata, very poorly preserved, 

 so that their identification is not fully certain. Also casts of Pocillopoi-a. Very little can be seen in the 

 rock with a lens; but in microscopic sections [672, 673] the following genera of foraminifera were 

 determined by Mr. Chapman : Discm-hina, Truncatulina, PlanorhuUna, Glohigerina, Carpenieria, Polytrcma 

 miniaceuni, P. planum, Gi/pdna, globulus, and Amplmtegina. Echinid spines. The calcareous sediment in 

 which the foraminifera are embedded is altered, so that the smaller constituents are not recognisable. The 

 pores in the rock are lined by crystals of calcite. The slit-like hollows probably contained Halimeda- 

 joints. 



(306). Length 55 millims. Cylindrical core of hard greyish-white rock, consisting principally of fine 

 calcareous sediment cemented by calcite [674] with fragmentary Glohigerina, Carpcnteria, Pol/jfrema iiiiniarewm, 

 Gijpsina, and Ainphistegina. Echinid spines. 



Samples of crushed rock. A microscopic section [848] of some of the fragments from 603 feet showed 

 Polytrema, Amphistegina, and Heterostegina, with some fragmentary casts of coral. 



Depth from Surface, 612-624: feet ; Distance Bored, 12 feet ; I'otal Leityth of Core 



Obtained, 0. 



No solid cores were obtained from this 12 feet of the boring, the only sample 

 preserved of the pounded-up rock consisted of fine angular and blunted chips of 

 greyish-white limestone with some detached samples of Amphistegina. 



Depth from Surface, 624-637 feet; Distance Bored, 13 feet; Total Length of Core 

 Obtained, 11 inches; Numbers of Cores, 307-312. 



The solid cores of this part of the boring consist of the same kind of hard, greyish- 

 white, cavernous and porous limestone as that recorded above from 598-612 feet^ 



