Table 3. Synoptic table of bottom samples collected 



Sam- 

 ple 



Sta- 

 tion 



Date 



Position 



and 

 depth in 

 meters 



Type of sample 



Estimated 

 CaCOs con- 

 tent in per 

 cent; basis 

 of estimate 



Color and physical characters 



51 



108 



1929 

 May 27 



18 26 N Volcanic mud 16; total CO2 (Moist) between light brownish- 



144 01 E olive and brownish-olive 



3573 m 192l(Y-0-Y) 



(U.S.B.S. class = clay loam) 



52 



109 



29 



23 22 N 



144 08 E 



5252 m 



Red clay 



< 5; inspection 



(Dry) avellaneous 173b(0-Y) 

 Clay; moderately coherent, 

 crumbly 



53 



110 



31 



26 20 N 



144 24 E 



3036 m 



Volcanic globiger - 

 ina mud 



48; total COj (Dry) pale pinkish-cinnamon 

 152f{y-0) 

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

 foraminifera; volcanic glass; slight- 

 ly coherent, pulverulent, gritty 



54 



55 



56 



1 1 1 June 3 



112 



113 



25 



31 00 N 



144 16 E 



6008 m 



33 51 N 



141 15 E 



3931 m 



34 44 N 



141 04 E 



2911 m 



Brown volcanic 

 mud 



Gray volcanic 

 mud 



Gray siliceous 

 volcanic mud 



5; total CO2 (Moist) light drab 173b(0-Y) 



Siltyclay (U.S.B.S. class = silty 

 clay loam); moderately coher - 

 ent, pulverulent 



< 10; inspec- (Dry) between hair-brown and 

 tion deep grayish-olive 19^i(Y-0-Y); 



(moist) silt; angular grains; 

 slightly coherent, crumbly^ grit- 

 ty feel 



4; acid solu- (Moist) deep grayish-olive 

 ble CaO 21'li(0-YY) 



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

 angular grains; moderately co- 

 herent, slightly sticky, gritty 



57 



115 



29 



37 40 N 



145 26 E 



5396 m 



Volcanic radiolar- 

 ian ooze 



1; acid (Dry) between buffy-brown and 



soluble CaO drab 173"V2h(0-Y) 



Silty clay lU.S.B.S. class = clay); 

 coherent, crumbly 



Sample 51. Organic remains include abundant pelagic foraminifera, common arenaceous and benthonic 

 foraminifera, and radiolaria. Predominant constituents of sand grades are angular fragments of fresh 

 pumice (index of refraction about 1.50), fresh, dark-colored vesicular basic glass (index of refraction 

 about 1.56), quartz, plagioclase feldspar, and hornblende. 



Sample 52. Very small fine-grained sample. Organic skeletal material is scarce, chiefly radiolaria and 

 sponge spicules. Basic volcanic glass (index of refraction somewhat less than 1.545), vesicular pumice, 

 plagioclase feldspar (labradorite and some andesine), green augite, quartz, magnetite, manganese grains 

 and flakes, limonite, clay mineral similar to that described for sample 50, and much fine unidentified 

 material make up bulk of the sample. 



Sample 53. Similar to sample 51, except that pelagic foraminifera are much more abundant and pumice 

 fragments are replaced in the sand grades largely by vesicular basic volcanic glass. Quartz is abundant. 



Sample 54. The organic remains consist of radiolaria shells (sometimes coated with manganese), fish 

 teeth, occasional diatoms, sponge spicules, fragments of pelagic foraminifera, and arenaceous foramin- 

 ifera, the latter consisting largely of angular grains of feldspar, sometimes coated with iron oxide, and 

 volcanic glass. About 60 per cent of the sand grades is made up of pumice (index of refraction about 

 1.50), other inorganic materials are biotite, manganese grains, some basic volcanic glass, and plagio- 



270 



