Table 3. Synoptic table of bottom samples collected 



Sam- 

 ple 



Sta- 

 tion 



Date 



Position 



and 

 depth in 

 meters 



Type of sample 



Estimated 

 CaCOs con- 

 tent in per 

 cent; basis 

 of estimate 



I 



Color and physical characters 



58 



59 



116 



117 



60 119 



61 



127 



23 



62 



128 



25 



63 



130 Sep. 



64 131 



44 16 N 



137 37 W 



4026 m 



40 37 N 



132 23 W 



3806 m 



37 05 N 



123 43 W 



3188 m 



33 49 N 



126 20 W 



4418 m 



Gray clayey mud 



Red clay 



Green mud 



Red clay 



1; acid solu- 

 ble CaO 



7; total CO2 



<5; inspec- 

 tion 



0.57; acid 

 soluble CaO 



(Dry) olive-brown 173k(0-Y); 

 (moist) silty clay (U.S.B.S. = 

 clay); frustules of diatoms; 

 moderately coherent, crumbly 



(Moist) mummy-brown 17^m(0-Y) 

 Silty clay (U.S.B.S. class = clay); 

 frustules of diatoms; moderate- 

 ly coherent, crumbly 



(Dry) between vinaceous-buff and 

 avellaneous 173c(0-Y) 



Clayey silt (U.S.B.S. class = clay); 

 frustules of diatoms; moderate- 

 ly coherent, crumbly 



(Dry) near light grayish-olive 

 2i4-l/2c(oYY); (moist) brown- 

 ish-olive 192m(YO-Y) 



Clay (U.S.B.S. class = clay); co- 

 herent; when moist, somewhat 

 plastic; when dry, brittle 



(Dry) between tilleul-buff and vi^ 

 naceous-buff 173e(0-Y) 



Clay (U.S.B.S. class =clay); few 

 shells of foraminifera; coher- 

 ent; when moist, slightly plas- 

 tic, moderately sticky; when 

 dry, brittle 



(Dry) between light grayish-olive 



and grayish-olive 2l4a(0-YY) 

 Clay; coherent, brittle 



(Dry) between light drab and dark 

 gray 174c(0-Y) 



Clay (U.S.B.S. class =clay); co- 

 herent, brittle 



piece of fresh pumice over 1 cm in diameter and 2 manganese -palagonite nodules of about the same size. 

 One of these, when sectioned (see plate XIII) shows the spherulitic alteration of colorless isotropic vol- 

 canic glass in the center, to reddish-orange palagonite, containing fresh phenocrysts of monoclinic feld- 

 spar and hornblende, near the surface. The palagonite spherulites are often surrounded by manganese; 

 some of them are entirely replaced by manganese, which is distributed in more or less laminar fashion. 

 Nearer the surface there are only isolated fragments of palagonite spherulites in the thick manganese 

 coating. 



Sample 58. Radiolaria are very abundant in this sample, but the principal component is perhaps diatoms 

 at least in the finer grades. Other organic components are sponge spicules and arenaceous foraminifera. 

 Inorganic components of sand grades include: rounded grains of fresh pumice, 3 mm in longest diameter, 

 in which there are porphyritic clusters of magnetite, hypersthene, green hornblende and plagioclase feld- 

 spar (labradorite, Ab45AnK5); a few semiangular fine-grained volcanic rock particles about 1 mm in di- 

 ameter which contain small crystals of plagioclase feldspar; together with plagioclase, quartz, basic 

 volcanic glass, and monoclinic feldspar. Subhedral hornblende is the chief heavy mineral, followed by 

 euhedral hypersthene, magnetite crystals, biotite, and colorless augite. Some of the plagioclase parti- 

 cles are zoned. 



Sample 59. Both diatoms and radiolaria make up a very large proportion of this sample, but diatoms pre- 

 dominate, especially in the finer grades. Other organic remains are arenaceous foraminifera, sponge 

 fragments, and pelagic foraminifera. Semiangular grains of quartzite, limestone, and a fine-grained vol- 

 canic rock are apparently ice-borne. Besides these, there are small aihounts of basic volcanic glass 

 (index of refraction greater than 1.56) and pumice (index of refraction 1.515). These are exactly similar 

 in appearance to the glass and pumice from samples 56 on, the glass being packed as usual with micro- 

 lites of feldspar. Some of the grains of the pumice are rounded. Very fresh plagioclase feldspar (labra- 

 dorite), quartz, monoclinic feldspar, biotite, hypersthene in euhedral single and twinned crystals, horn- 

 blende, magnetite and pyroxene (?) are also present in the sand grades. 



272 



