EXPLANATION OP SEDIMENT ANALYSIS SIMMARY SHEETS 



Results of bottom sediment analysis performed by the U. S. Navy 

 Hydrographic Office are recorded on the sediment analysis sheet. Almost 

 all bottom samples are analyzed veeks after the collection of the samples; 

 therefore, various procedures normally carried out during a routine sedi- 

 ment analysis are not attempted. Determinations such as: wet density, 

 water content, porosity, etc., are not possible after the samples have 

 lost their "in situ" moisture; therefore, these parameters are not in- 

 cluded on the analysis sheet. 



The following is a description of the terms employed on the sediment 

 analysis sheets) 



1. Ship . The name of the ship used for collecting bottom sample. 



2. Sample Number . A consecutive number, commencing with 1, assigned 

 to each bottom grab sample or core taken successively throughout the 

 cruise. 



3. Latitude . Expressed in degrees, minutes, and seconds. 

 k. Longitude . Expressed in degrees, minutes, and seconds. 



5. Date . Day (GMT), month, and year. 



6. Cruise . The code name of the operation during which the bottom 

 sample was taken. 



7. Sampler Type . Identified by name or designation of device 

 employed. 



8. Water Depth . The uncorrected sonic sounding recorded to the 

 nearest whole fathom and meter. 



9. Core Length . Recorded to a fraction of an inch and centimeter 

 as observed in the laboratory. This information is not given when a grab 

 sampler was employed. 



10. Core Penetration . Recorded to a fraction of an inch and centi- 

 meter as observed in the field. This information is not given when a 

 grab sampler was employed. 



11. Laboratory Number . A reference number assigned to each sub- 

 sample which is retained in the laboratory sample file. 



12. Subsample Depth in Core . Depth from the core top of the sub- 

 sample top and bottom recorded to a fraction of an inch. This infor- 

 mation is not entered when a surface grab sample was obtained. 



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