III. EXPLANATION OF SEDIMENT ANALYSIS SUMMARY SHEETS 



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

 Hydrographic Office are recorded on the sediment analysis summary sheets. Almost 

 all bottom samples are analyzed weeks after the collection of the samples; therefore, 

 various procedures normally carried out during a routine sediment 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, all values 

 left blank on the summary sheets indicate these values could not be accurately 

 determined . 



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

 summary sheets: 



1. Sample Number . A consecutive number, commencing with 1, applied to 

 each bottom grab sample or core taken successively throughout the cruise. 



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



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



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



5. Sampler Type . Identified by name of device employed . 



6. Water Depth (fm .) . The uncorrected sonic sounding recorded to the nearest 

 tenth of a fathom . 



7. Core Length (in .) . Recorded to the nearest whole inch as observed in the 

 laboratory. This information is not given when a grab sampler is employed. 



8. Core Penetration (in.) . Recorded to the nearest whole inch as observed in 

 the field. This information is not given when a grab sampler is employed. 



9. Laboratory Number . A reference number assigned to a fraction of a sample 

 retained by the Laboratory . 



10. Subsample Depth in Core (in.) . Depth to the nearest whole inch of the 

 mean depth of the subsample. This information was not entered when a surface grab 

 sample or a short core sample was obtained. The analysis of the subsample is 

 assumed as representative of the entire core length. 



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