36 



MARINE BOTTOM SAMPLES OF LAST CRUISE OF CARNEGIE 



Table 1. Synoptic table of bottom samples collected 



79 151 



25 



12 40N 



137 32 W 



4918 m 



Radiolarian ooze 



1; acid solu- 

 ble CaO 



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

 (SlighUy moist) clay (U.S.B.S. 

 class=clay); coherent, plastic 



(Dry) wood-brown 173(0-Y) 

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

 herent, brittle 



(Moist) mummy-brown 17lm(0-Y) 

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

 erately coherent, brittle, when 

 dry 



(Dry) between fuscous and fus- 



cous-blacl£ 134l(OY-0) 

 Sandy silt; angular grains of 



manganese; slightly coherent, 



gritty 



(Moist) olive-brown 173k(0-Y) 

 Clay; coherent, plastic 



(Dry) drab 174(0-Y) 

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

 coherent, brittle 



(Dry) between dark Quaker-drab 

 and sooty-black l5l(red) 



Two cinders of volcanic rock 

 coated with manganese. 

 Average diameter approxi- 

 mately 1 cm 



(Moist) near wood-brown; 



173-l/2(0-Y) 

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



moderately coherent, slightly 



plastic, sticky 



80 153 



29 



7 45N 

 141 24 W 

 5003 m 



Radiolarian ooze 



Trace; acid (Moist) Saccardo's umber 

 soluble CaO 172k(0-Y) 



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

 shells of foraminifera; moder- 

 ately coherent, slightly plastic 



Sample 72. Contains large amounts of siliceous organisms including radiolaria, sponge spicules, and arena- 

 ceous foraminifera; a few pelagic foraminifera and fish teeth are also present. Inorganic constituents of 

 sand grades include pumice (in grains ranging up to 3 mm in diameter), manganese grains, feldspar, and 

 hornblende. 



Sample 73. Sand grades are small in amount. Organic remains include radiolaria, sponge spicules, 

 arenaceous foraminifera and a few fish teeth. Manganese grains are common; other constituents of sand 

 size are fresh and partially altered feldspar, hornblende, brown mica, and augite. 



Sample 74. The small amounts of sand grades contain radiolaria, sponge spicules, fish teeth, arenaceous 

 and pelagic foraminifera, also abundant manganese grains, pumice (often stained red brown), feldspar, 

 and fractured euhedral grains of magnetite. 



Sample 75. Consists of opaque angular grains of volcanic ash (less than 2 mm in longest diameter), coated 

 with manganese, together with angular manganese grains, reddish-yellow, irregularly shaped, blrefrln- 

 gent aggregates (beidellite), rare plagioclase feldspar, and considerable iron oxide. 



Sample 76. Small, fine-grained sample, contains much birefringent material, also basic volcanic glass, 

 small irregular grains of calcium carbonate of unknown origin, plagioclase feldspar, augite, needles of 



