Table 1. — Chemical and physical properties of bottom sediments 

 by stations 



Station G\ 6? 6? 68 68 



Cruise 2^525 



Sample No. 23 l+8l l<-38 '2^ ^1 



Latitude N. 3l+°ll« 3i+°ll' 3^°11' ^^""^V 3»+°22» 



Longitude W. 77°30' 77°30' 77°29' 7T°10' 7T°09' 



Depth (meters) 16 20 l8 20 22 



Date (mo., day, yr.) 5-9-53 11-9-53 2-17-5*+ 5-9-53 2-20-5^ 



Sediment Type Gr Sa Sa Gr Sa Or Sa Sa 



Loss on Ignition, ^ 10.11 9.37 10.1? 7-92 ^-50 



Insoluble Residue, ^ 72.57 78.85 68.12 78.57 85.69 



AI2O3, i 0.09 0.11 0.13 0.12 0.09 



Fe203, ^ 0.38 0.14-9 0.70 0.3*+ 0.23 



MnO, ^ 0.02 0.01 0.00 0.00 0.00 



MgO, ^ 0.72 0.57 0.65 0.14-0 0.31 



CaO, i> 11.31 11.^2 12.53 6.87 5.95 



K2O, ^ 0.12 0.08 0.08 0.08 0.05 



P2O5, i> 5.25 3A2 5.26 1.1+7 5.61 



Sr, ^ 0.26 O.II+ 0.18 O.ll^ 0.22 



CI, '^ 0.1+6 0.1+8 0.51 0.33 0.1+2 



Organic Nitrogen, ^ 0.002 0.013 O.OOI+ 



Organic Carbon, ^ 0.020 0.153 O.O8O 



CaC03, ^ 36.0 26.7 9A 



Gravel, ^ I3.67 2.55 13-50 19-31 0.00 



Sand, ^ 79.I19 96.29 85-13 80.35 99-91 



Silt, ^ 6.81+ 1.16 1.37 °-3^ 0-09 



Clay, ^ 0.00 0.00 0.00 0.00 0.00 



Median Diameter (ram) 0.25 0.32 O.38 0.68 0.31 



Sorting (Trask) 2^00 1.13 1-53 1*38 °-^5 



First Quartile (mm) 0.1+5 ^-50 O.i+0 



Third Quartile (ram) 0.21 0.35 0.21^- 

 Sieve Weight, ^ (rau) 



+ 2000 13.67 2.55 13.50 19-31 0.00 



+ 1000 2 10 3 77 3.17 II+.38 0.68 



500 l,;91 13A6 12.36 23.06 9-98 



250 18,83 1+3-78 31.i+7 30.71 61.86 



+ 125 l,l,.l,2 32.38 35.li+ 11-19 26.37 



+ 62 Q.23 2.90 2.99 1-01 1.02 



- 62 6.81+ 1.16 1.37 0-3^ 0-09 



Heavy Mineral, ^ 29 O.6I 0.29 



Light Mineral, ^ 99 [^1 99-39 99-71 



Bioclastic, ^ gj^ 3I1 g^ Sh Sh 



+ 

 + 



75 



