22 



MARINE BOTTOM SAMPLES OF LAST CRUISE OF CARNEGIE 



Table 1. Si^noptic 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 



moist, coherent and plastic; 

 when dry, moderately coherent 

 and crumbly 



24 61 Dec. 28 



38 29 S 

 94 14 W 

 3299 m 



Globigerina ooze 



86; total CO2 (Moist) avellaneous 173b(0-Y) 

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

 loam); shells of foraminifera 

 and manganese nodules up to 1 

 cm; slightly coherent, crumbly 



27 64 



28 65 



29 67 



30 88 



10 



31 54 S 

 88 17 W 

 3879 m 



31 07 S 

 86 39 W 

 3626 m 



24 57 S 

 82 15 W 

 1089 m 



21 28 S 

 80 26 W 

 4156 m 



Globigerina ooze 



Globigerina ooze 



Globigerina ooze 



Red clay 



43; acid solu- 

 ble CaO 



66; total CO2 



94; acid solu- 

 ble CaO 



3; total C02 



(Dry) avellaneous 173b(0-Y); (wet) 

 Saccardo's umber 172k(0-Y) 



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

 shells of foraminifera; coher- 

 ent, brittle 



(Moist) between wood-brown and 



buffy-brown 173h(0-Y) 

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



loam); shells of foraminifera; 



moderately coherent, crumbly, 



granular 



(Dry) between cinnamon -brown 

 and Saccardo's umber 

 16l-l/2k(Y-0) 



Sandy clay (U.S.B.S. class=silt 

 loam); small shells of foramin- 

 ifera; coherent, brittle 



(Dry) vinaceous-buff 173d(0-Y) 

 Sand (U.S.B.S. class=fine sand); 



shells of foraminifera; slightly 



coherent, crumbly 



(Dry) light pinkish-cinnamon 

 152d(Y-0) 



(Moist) Sand (U.S.B.S. class=fine 

 sandy loam); shells of foramin- 

 ifera; slightly coherent, 

 crumbly 



(Wet) raw umber 17m(0-Y) 

 Sandy clay; shells of foramini- 

 fera and angular mineral grains, 

 plastic, greasy feel 



Sample 24. Contains abundant irregularly shaped manganese grains and nodules up to 6 mm in largest 

 diameter. The silt grade consists largely of broken pelagic foraminifera, with only a small proportion oi 

 manganese grains, hence is very light in color when compared with the silt grades of samples 20 to 23. 



Sample 25. Sand grades consist largely of pelagic foraminifera, many broken, some exhibiting recrystal- 

 lization; benthonic foraminifera are common, manganese grains, echinold spines, sponge spicules, and 

 ostracods are rare. Phillipsite in small twinned crystals, cloudy plagioclase feldspar, chlorite palago- 

 nite, and altered volcanic glass are also present in sand grades. 



Sample 26. Many pelagic foraminifera are broken, some exhibit recrystallization; benthonic foraminifera 

 are fairly common (Cassidulina fava noticeable); sand grades also contain manganese grains, radlolarla, 

 sponge spicules, echinoid spines, and ostracod tests. 



Sample 27. Sample is very high in manganese, iron, and phosphate. Benthonic foraminifera are extremely 

 abundant. Practically all pelagic foraminifera are broken, and many exhibit recrystallization Manga- 

 nese grains are not so abundant as in sample 22 but contain as usual nuclei of acid volcanic glass. About 

 . half of sand grades consist of ellipsoidal or ovoid pellets, 0.1 mm to 1 mm in diameter, possibly formed 



