Partic 



le 



Diamet 



er 



(phi) 





-2 to 



-1 



-1 to 



1 



1 to 



2 



2 to 



4 



4 to 



8 



> 



8 



Color: Color of sediment is based on the Geological Society of America Rock- 

 CoToF Chart. 



Sediment Grain Size : The sediment grain size scale used is the one categorized 

 by the classification set forth in the Wentworth grade scale (Wentworth, 1922) 

 with one modification. The term clay has been replaced by the term lutite 

 because of the mineralogical implications of the former. The range of grade 

 size in millimeters diameter and phi units [O = - log2 diameter (millimeters)] is 

 shown below: 



Particle 



Diameter 



(mm) 



Granules 2.0000 to 4,0000 



Coarse sand 0.5000 to 2.0000 



Medium sand 0.2500 to 0.5000 



Fine sand 0.0625 to 0.2500 



Silt 0.0039 to 0.0625 



Lutite < 0.0039 



SEDIMENTS 



General 



On the basis of lithology and physical properties, the sediments collected from 

 the TOTO are divided into 3 geographic categories; 1) near flank, 2) axial, and 

 3) cul-de-sac (Fig 6). The bottom sediments in the TOTO display properties and 

 relationships distinctive of these areas in the channel, but, gradational transitions 

 from one type sediment to the other is present, and combinations of various types 

 exist. 



Irrespective of lithological and physical variations in the sediments, both 

 calcium carbonate content and specific gravity of the solids show no significant 

 variation with depth or location, but are generally uniform throughout the bottom 

 and vary between narrow margins. Of a total of 315 core subsamples analyzed for 

 calcium carbonate, the maximum value obtained was 100 percent, the minimum 82 

 percent, and the average 94 percent. Specific gravity determinations were run on 

 32 subsamples from representative cores, and the values obtained ranged from 2.68 

 to 2.86 with an average of 2.79. 



The results of a semiquantitative spectrochemical analysis by the University of 

 Miami (1958) are given below, and may be taken to represent (±20 percent) other 

 possible elements and compounds present in the TOTO sediments where CaCOo does 

 not comprize the entire sample. 



13 



