28 



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 

 CaCOa con- 

 tent in per 

 cent; basis 

 of estimate 



Color and physical characters 



45 85 



1929 

 Mar. 



46 



86 



17 12 S 



136 37 W 



3791 m 



17 36 S 



141 55 W 



2132 m 



Ferruginous glo- 

 bigerina ooze 



94; acid 

 soluble CaO 



Globigerina ooze? 90; inspection 



(Dry) pale pinkish-cinnamon 

 152f{Y-0); (moist) between 

 avellaneous and wood-brown 

 173a(0-Y) 



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

 sandy loam); shells of fora- 

 minlfera; when wet, slightly 

 coherent, granular; when dry, 

 moderately coherent, pulveru- 

 lent granular 



(Dry) fuscous 134k(OY-0) 

 Manganese nodules up to 1 cm 

 in diameter partly covered 

 with small unbroken shells of 

 pelagic foraminifera 



47 87 11 18 05 S Calcareous red 15; total C02 (Moist) between bister and sepia 



145 33 W clay 162m(Y-0, 0-Y) 



4315 m (Dry) clay; coherent, brittle 



48 94 Apr. 22 



12 47S 



171 35 W 



4760 m 



Red clay 



<10; inspec- (Dry) between light drab and 

 tion avellaneous 173-l/2b(0-Y) 



Clay; moderately coherent, 

 pvdverulent 



49 96 



26 



6 47S 



172 23 W 



5269 m 



Red clay 



<1; total C02 (Moist) between snuff -brown and 

 bister 152l(Y-0); (dry) avella- 

 neous 173b(0-Y) 

 Clay (U.S.B.S. class«clay); co- 

 herent, brittle 



50 97 



28 



3 47S 



172 39 E 



5253 m 



Red clay 



<10; inspec- (Dry) between Saccardo's umber 

 tion and buffy-brown 172-l/2j(0-Y) 



Color of coarser fraction (dry) 

 between avellaneous and light 

 drab 173-l/2b(0-Y) 

 Silty clay; moderately coherent, 

 pulverulent, somewhat gritty 



Sample 45. Sand grades are simUar to sample 44, except that a greater proportion of pelagic shells are 

 unbroken and phUlipsite crystals and aggregates are less common. The silt and clay grades apparently 

 contain much more calcium carbonate than sample 44. 



Sample 46. The estimate of CaCOa content for this region is based on the fact that the small tests of 

 pelagic foraminifera found on the manganese nodules are unbroken and fresh in appearance. 



Sample 47. Well-formed, ovoid-shaped pellets of fine material, usually containing fragments of foraminif- 

 era! shells and sometimes cemented together by a coating of manganese, predominate in the coarser sand 

 grades. Benthonic foraminifera make up a large part of the calcium carbonate content, together with bro- 

 ken shells of pelagic foraminifera, fish teeth, and unidentified calcareous materials; sponge spicules are 

 also present. Manganese grains, volcanic rock fragments, palagonite and philllpslte are common, where- 

 as biotite, feldspar, and hornblende are rare constituents of the sand grades. 



Sample 48. The sample is very fine-grained but too small for mechanical analysis. Contains radlolarla, 

 sponge spicules, coccoliths, and unidentified, irregular -shaped calcareous material, as well as basic 



