24 



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 



31 



1929 

 69 Jan. 12 



32 70 



13 



16 49 8 

 78 39 W 

 3657 m 



13 53 S 

 77 54 W 

 4742 m 



Siliceous (calcar- 

 eous) red clay 



20; total C02 



Green diatom mud < 1 ; total CO2 



(Moist) buffy-brown 173i(0-Y) 

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



small shells of foraminifera; 



coherent, moderately plastic 



(Dry) smoke-gray 2l4d(0-YY) 

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

 moderately coherent, brittle 



33 71 Feb. 6 



11 57 S Green silty mud <1; inspection (Dry) pale smoke-gray 2l4f(O-YT0 



78 37 W Silty clay; moderately coherent, 



3357 m crumbly, slightly gritty 



34 72 



35 74 



12 



9 58S 

 82 low 

 4480 m 



11 00 S 

 87 24 W 

 4141 m 



Green clayey mud 



Siliceous red clay 



0.25; acid 

 soluble CaO 



0.91; acid 

 soluble CaO 



(Moist) smoke-gray 2l4b(0-YY) 

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

 herent, brittle 



(Moist) Saccardo's umber 

 172k(0-Y) 



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

 erately coherent, sticky, greasy 

 feel 



36 75 



37 



76 



14 



16 



14 15 S 

 92 05 W 

 3480 m 



15 18 S 

 97 28 W 

 3197 m 



Globigerina ooze 



Globigerina ooze 



91; acid 

 soluble CaO 



93; total CO2 



(Moist) between vinaceous-buff 

 and avellaneous 173c(0-Y) 



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

 shells of foraminifera; moder- 

 ately coherent, granular 



(Moist) 



(U.S.B.S. class=sand); incoher- 

 ent, granular; shells of fora- 

 minifera 



Sample 31. Sand grades consist principally of remains of radiolaria, sponge spicules, and diatoms, together 

 with numerous calcareous benthonic and some arenaceous and pelagic foraminifera, the latter exhibiting 

 slight recrystallization; also present are echinoid spines, chitinous remains, light-colored rod and disk- 

 shaped pellets, green-brown mica (sometimes considerably altered), euhedral green-brown hornblende in 

 colorless pumice, plagioclase feldspar (Ab50An50), angular quartz, and olivine (?). 



Sample 32. Consists largely of remains of siliceous organisms, especially diatoms, together with light 

 grayish-green clayey material. The sand grades contain numerous light grayish-green rounded and irreg- 

 ularly Shaped aggregates of clayey material and siliceous organisms, together with plant material, flakes 

 of brown and greenish mica, sometimes considerably altered, quartz, and feldspar. 



Sample 33. Too small for detailed examination. Appears to be similar to sample 32, except that remains 

 of siliceous organisms are relatively less in amount. Contains abundant fresh and partially decomposed 

 plagioclase (labradorite and oligoclase), quartz, green mica, green hornblende, augite, epidote or cllno- 

 zoisite (2V about 90°), green garnet or ceylonite, rutile, apatite, magnetite (?), basic volcanic glass, 

 calcite crystals, little clay. 



