Figure 9. The sea floor at 18, 150 feet reveals evidence 

 of biological activity, such as the whitish sediment 

 brought to the surface by burrowing animals. The "pock- 

 marked" light-brown sea floor was noted to slope down- 

 ward slightly to the left. The heavy concentration of 

 suspended matter near the bottom can be noted in the 

 figure. Dive No. 61. 



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