220 



0»55N 



roo'N 



0'55'N 



29°16'W 18 20 22 29'24W ' 



CONTOURS 100 FATHOM INTERVALS A B PROFILE OF SLOPE FROM ST PAUL'S ROCKS 



SHIPS TRACK FOR DREDGE 43 INTERVAL. 1610 FATHOMS TO 1080 FATHOMS DEPTH. 



„ ^^ST PAUL'S ROCKS SURFACE 



Fig. 1. Bathymetry and location of dredge A 11-20, 43, St. Paul's Rocks. 



intrusion, and is probably much younger than the com- 

 monly deformed and altered rocks which riin the intru- 

 sion. A large amount of talus derived from the islet was 

 in the dredge on top of the alkali basalt fragments; 

 evidently this talus was the last material to enter the 

 dredge. 



Table 1 gives the bulk analysis of a sample from which 

 the nodules were extracted after coarse crushing. The 

 basalt is perfectly fresh in hand specimen and in thin 

 section. To remove any possible salt contamination, the 

 sample was washed in distilled water after fine grinding. 

 The high titania, soda and potash, and the low silica, are 

 particularly significant in the analysis. These features, 

 and the presence of nepheline in the norm, clearly place 



