REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 243 



(54a) [702]. Length 93 millims. Whitish-gi'ey, hard, partly compact, })artly porovis, dolomitic lime- 

 stone. Several casts of small Titrhinaiia encrusted by Vohifrciaa jdanum and thin layers of Liiliolhaninioii. 

 Larger pait of core consists of foraniinifei'a., including OrbiloUfcs, G//ji.sina, ^-1 nijihisfci/ma and Jfeferostcr/ina, 

 and with these small detrital organic fragments. Alcyonarian spicules. Echinid spines. Cheilostomatous 

 polyzoa. 



DejJth fro)n Surface, 763-77 L feet; Distance Bayed, 8 feet; Total Lefigth of Core 

 Obtained, b feet 3 inches; Numbers of Cores 55a-73a. 



Ill this 8 feet of the boring the cores are cylindrical, of whitish-grey to grey, hard, 

 partly compact, partly porous, and occasionally cavernous dolomitic limestone. Casts 

 of corals are present throughout, they are indistinct owing to their imperfect 

 preservation, mostly small forms, some are probably in position of growth. They 

 comprise Seriatopora, Pocillopoixt, Go7iiastrcBa, and, other indeterminable Astrseans, 

 Galaxea (?), Ci/close7-is, Madrepora, Turbinaria and Porites. The larger part of the 

 cores as a rule consists of foraminifera and fragmental detrital materials, partly of 

 broken-up foraminifera, and partly of minute fragments of other organisms. These 

 are cemented together by the crystalline dolomitic matrix, which sometimes entirely 

 fills up the interspaces, forming a very dense compact rock, at others, not infrequently 

 in close proximity to the compact portions, the interspaces are only lined by crystals, 

 and the rock is porous. Foraminifera are relatively fewer and less distinct than in 

 the preceding cores, and they are to a certain extent masked by the fine debris which 

 constitutes a considerable part of the rock. Polytrema planum is less abundant than 

 in preceding cores, the other forms belong to Orbitolites, Globigerina, Gypsina, 

 Amphistegina, Hetei'ostegina, and in the first two and in one of the lower cores, 

 Cycloclypeus. Alcyonarian spicules, echinid spines, Halimeda, and Lithothamniori, 

 but sparsely represented. No signs of stratification or bedding lines in the cores 

 where the fine material predominates. 



Dktails. 



(55a). Length 108 millims. Greyish, hard, for the most part compact and dense rock. Several casts 

 of perforate corals; Madvqwru, Turhinariu, and undetermined forms. Greater part of core consists of 

 foraminifera and fragmental materials. Orhiiolitai complanata common, Pohjirema planum, Amphistegina, 

 Heierosfegina, and C//cIoch/pcus (1) rare. 



(56a). Length 103 millins. Greyish, hard, in part compact, with some cavities where corals have been 

 dissolved away. Several small coral casts are dispersed through the core. FociUopora, an undetermined 

 Astrsean, Uychserh, and Madrepora. Some of these casts are enclosed by layers of Polytrema planum, which 

 in section appear as thick white rings surrounding the partially vacant cast of the coral. Foraminifera 

 and detritus the same as in the preceding. Cheilostomatous polyzoa. 



(57a). Length 60 millims. Rock similar to preceding. Small casts of Pocilloponi, Madrepora, and Porif('s{1) 

 very much obsciu-ed. 



.(58a). Length 57 millims. Grey with whitish patches, hard, porous, and with small cavities. Casts of 

 an Astrsean, Madrepora (1) and other perforate corals, mostly encrusted by thick layers of Polytrema planum. 

 Orbitolites, Amphistegina, and Heterostegina, mingled with fragmental materials. 



2 T 2 



