on cruise VII of the Carnegie in the Pacific--Continued 



Sampler 

 and con- 

 tainer used 



Field notes 



Nearest previous samples 



Sigsbee-Ross Snapper successful; weights de- 

 snapper; 12- tached. Good sample, reddish- 

 oz. bottle brown and green mud 



None 



Sigsbee-Ross Good sample brown-gray mud 

 snapper; 12- 

 oz. txittle 



None 



Sigsbee-Ross Good reddish-brown ooze in 

 snapper; 12- snapper 



oz. bottle 



None 



Sigsbee-Ross 

 snapper; 2 12- 

 oz. bottles 



None 



Sigsbee-Ross 

 snapper; 2 

 12-oz. bottles 



None 



Sigsbee-Ross 

 snapper; vial 



Sigsbee-Ross 

 snapper; 12- 

 oz. bottle 



Snapper did not close. Small 

 amount of dark green mud in 

 jaws 



None 



Snapper full of light brown clay None 



Sample 60. Diatoms greatly predominate in this sample. A few radiolaria and arenaceous foraminifera 

 are present. Subrounded to subangular grains of volcanic rock, quartzite and unidentified fine-grained 

 rocks, together with pumice, quartz, and volcanic minerals, as above, are present in the sand grades. 

 Samples 56 to 60 are strikingly similar in chemical composition, but show a progressive increase in num- 

 ber of siliceous organisms, especially diatoms, arid a decrease in volcanic components, particularly 

 heavy minerals, toward the east. Ice-borne fragments also increase in number toward the east. 



Sample 61. Radiolaria predominate in the sand grades. Arenaceous foraminifera are common, and sponge 

 spicules and fish teeth are found. A few diatoms occur in the finer sand and silt, as well as some uniden- 

 tified calcareous material. The inorganic constituents of the sand grades include pumice (index of re- 

 fraction about 1.50), plagioclase feldspar (oligoclase Ab75An25), manganese flakes, and basic volcanic 

 glass, the latter sometimes coated with iron oxide. The color of this sample indicates terrigenous influ- 

 ence even though the distance from shore is great and the nitrogen content is not larger than that of other 

 north Pacific clays. 



Sample 62. Radiolaria predominate in the sand grades. Other components of sand size are fragments of 

 pelagic foraminifera, abundant benthonic foraminifera (ratio of pelagic to benthonic foraminifera about 7 

 to 1), fish teeth, echinoid spines, arenaceous foraminifera, manganese grains, biotite, feldspar, and horn- 

 blende. 



Sample 63. Very small, fine-grained sample. Contains abundant radiolaria, also diatoms and sponge spic- 

 ules, green hornblende, green garnet, titanite or octahedrite, quartz, brown mica (2E about 15 degrees), 

 monoclinic feldspar, basic volcanic glass, brownish glauconite (?)■ magnetite, and unidentified fine- 

 grained material. 



Sample 64. Radiolarian skeletons are most abundant organic remains; arenaceous foraminifera are com- 

 mon; sponge spicules, black volcanic rock fragments, manganese grains, biotite, pumice and basic volcan- 

 ic glass, the latter sometimes slightly birefringent, palagonite, plagioclase feldspar, and hornblende are 

 observed in the sand grades. 



273 



