20 



MARINE BOTTOM SAMPLES OF LAST CRUISE OF CARNEGIE 



Table 1. Synoptic table of bottom samples collected 



Sam- 

 ple 



Sta- 

 tion 



Date 



Position 



and 

 depth in 

 meters 



Type of sample 



Estimated 

 CaC03 con- 

 tent in per 

 cent; basis 

 of estimate 



Color and physical characters 



1928 



18 51 Dec. 1 



19 52 



20 54 



14 



21 57 



22 59 



20 



24 



23 60 



26 



29 06S 



114 48 W 



2898 m 



31 28 S 



112 51 W 



2851 m 



29 17 S 



108 54 W 



3061 m 



33 59 S 



106 43 W 



3139 m 



39 51 S 



101 04 W 



4116 m 



40 24 S 

 97 33 W 

 4007 m 



Globigerina ooze 



Ferruginous glo- 

 bigerina ooze 



Globigerina ooze 



Ferruginous glo- 

 bigerina ooze 



Ferruginous glo- 

 bigerina ooze 



Globigerina ooze 



94; acid solu- (Wet) near vinaceous-buff 

 ble CaO 182-l/2d(0-Y) 



Clayey sand (U.S.B.S. class= 

 clay); moderately coherent, 

 granular 



86; acid solu- (Wet) buffy-brown 173i(0-Y) 

 ble CaO Sandy clay (U.S.B.S. class= 



clay); shells of foraminifera; 

 moderately coherent, sticky, 

 granular 



Top 76, bot- Top: (moist) olive-brown 

 tom 80; 173k(0-Y); Bottom: (moist) 



total C02 olive-brown 173k(0-Y) 



Sandy clay; shells of foramini- 

 fera; (top, U.S.B.S. class=clay; 

 bottom, U.S.B.S. class=silty 

 clay loam) 



84; acid solu- (Dry) avellaneous 173b(0-Y) 

 ble CaO Sandy clay (U.S.B.S. class=clay); 



small shells of foraminifera; 

 slightly coherent, crumbly 



42; acid solu- (Wet) between Brussels brown 

 ble CaO and raw umber 16m(Y-0,0-Y) 



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

 small shells of foraminifera, 

 and aggregates of fine material; 

 coherent 



75; acid solu- (Dry) avellaneous 173b(0-Y) 

 ble CaO Sandy clay (U.S.B.S. class=clay); 



shells of foraminifera; when 



Sample 17. Sand grades consist largely of unbroken pelagic foraminifera, together with manganese grains 

 and small volcanic glass shards, whereas silt grade contains very abundant small manganese and iron 

 hydroxide grains. Sample also contains fragments several cm in diameter of a black, slightly vesicular, 

 very brittle basic glass exhibition conchoidai fracture. These appear to have been thickly coated with 

 manganese only on one side, indicating the top of a submarine lava flow. There are numerous cracks 

 lined with orange and greenish palagonitic material containing phillipsite crystals. The glass itself (see 

 plate Xin) is very fresh and unaltered, containing microscopic glomeroporphyritic clusters of basic pla- 

 gioclase feldspar, small, euhedral partially altered olivine crystals, wedge and triangular shaped titanlte, 

 twinned alteration products, and augite. The relatively low co^itent of alkalies shown by chemical analysis 

 indicates that this rock is a member of the circum-Pacific suite, as contrasted with the rocks of Tahiti 

 and other Pacific islands which are alkaline. 



Sample 18. Sand grades consist almost entirely of unbroken pelagic foraminifera together with traces of 

 echinoid spines, ostracod shells, benthonic foraminifera. Clay grade makes up nearly 60 per cent of 

 sample, consists largely of finely divided calcium carbonate, with a few coccoliths. 



Sample 19. Sand grades consist principally of light brownish-colored pelagic foraminifera, almost entire- 

 ly unbroken, and a few benthonic foraminifera, together with pink and black irregularly shaped grains of 

 organic (?) origin, echinoid spines, ostracod shells, and sponge spicules, one light gray fragment of acid 

 pumice, and manganese grains. 



