REPORT ON MATERIALS FROM THE BORINGS AT FUNAFUTI ATOLL. 219 



Depth from Surface, 41 0-420 /eei ; Distance Bored, 10 feet ; Total Length of Core 

 Obtained, 10 inches ; Nnmhers of Cores, 207-213. 



From the greater part of this 10 feet of the boring only broken up, small fragments 

 and powdered rock were obtained, but between 415 and 417 feet some rounded 

 nodrdes and partly cyHndrical cores of solid rock, having a length altogether of 

 10 inches, were brought up. These cores are of hard, whitish limestone, j^artly 

 compact, and partly with pores and small cavities where corals have been dissolved 

 away. The corals are now as casts, poorly preserved ; they consist of Pocillopora, 

 an Astrsean, genus uncertain, Cfdorico, Madrepora contccta, Mady^epora sp., and 

 portions of the stem of Lobophytum. The spicules in this latter partly retain their 

 fibrous structure, but most of them appear in thin section to be changed to an 

 opaque amorphous material. The corals in the solid cores are surrounded by 

 foraminifera and organic fragments, and consolidated by calcite. The foi'aminifera 

 are of the usual kinds, the genera are given below, their structure is fairly well 

 preserved. Amp)histegina Lessonii is the predominant form. The crushed rock- 

 fragments appear to be of a similar character to the solid cores. 



Details. 



(207). From 415 to 417 feet. Length 4-5 millims. [6.53]. A nodular core, rounded by drill ; it contains 

 casts of an Astrjean coral, and of Madrepora sp. The rock is mainly foraminiferal ; the following genera 

 are present : Orhitolites, Carpenteria, Poli/trema miniarenm, Gijpdna, Calcarina, and Amphistegina ; also 

 alcyonarian spicules axid Lithofhamnion in small fragments. 



(208-210). Three irregular rubbly pieces of whitish, hard rock, with a total length of 68 millims. Casts 

 of Madrepora confeda, Orhitolites, Amphistegina. Echinid spines. 



(211). Length 55 millims. Cylindrical core, rock cavernous. Casts of Foeillopora and Madrepora. 

 Foraminifera as in preceding. 



(212). Length 50 millims. [654]. Core cylindrical, cavernous. Casts of Madrepora and Foeillopora. 

 Stem of Lohophi/tuiri, 40 millims. in length by 8 millims. in diameter, an agglomeration of spicules nearly in 

 contact, the interspaces filled in with calcite. The following foraminifera are shown in a microscopic 

 section of the core : Orhitolites, Te.rtularia, Carpenteria, Calcarina, Polytrema miniaceum, P. pilanum, 

 ArnpMstegina, and Ilrtrrostegina, also fragments of Litlwtliamnion . 



(21.3). Length 40 millims. Irregular bmip of white cavernous rock, worn by the drill ; it contains 

 casts of Cceloria and Madrepora. 



From 417 to 420 feet. Sample of broken-up angular fragments of rock and powdered material brought 

 up in the sand-pump. Casts of Pocillqwra, and fragments of perforate corals. Alcyonarian spicules, 

 echinid spines. Microscopic sections of some of the rock chips [845] exhibit casts of corals and foraminifera 

 in a fine detrital sediment. Orhitolites, Spirolocvlina, Carpenteria, Poh/trema miniaceum, Gijpsina inhcerens, 

 and Amphistegina. 



Depth from Surface, 420-450 feet ; Distance Bored, 30 feet ; Total Length of Core 

 Obtained, I foot 6 inches ; Numbers of Cores, 214-222. 



Between 420 and 430 feet of the boring no solid cores were brought up, nor has 

 any of the broken-up and powdered rock been preserved ; below 430 feet, solid coi-es 



2 F 2 



