EXPLANATION OF SEDIMENT ANALYSIS SUMMARY SHEET 

 (OCEANOGRAPHIC LOG SHEET -R) 



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 collec- 

 tion 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 sedi- 

 ment analysis summary sheets: 



1. Cruise Number . This number is arbitrarily assigned. It identi- 

 fied the cruise and provides a means of sorting from the IBM files all 

 cards pertaining to that particular cruise. 



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

 to each bottom grab sample or core taken successively throughout the 



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



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



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



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



7. Water Depth (m) . The uncorrected sonic sounding recorded to the 

 nearest hundredth of a meter. 



8. Core Length (cm) . Recorded to the nearest tenth of a centimeter 

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

 sampler is employed. 



9. Core Penetration (cm) . Recorded to the nearest centimeter as 

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

 is employed. 



10. Laboratory Number . A reference number assigned to a fraction 

 of a sample retained by the Laboratory. 



11. Subsample Depth in Core (cm) . Depth to the nearest tenth of a 

 centimeter of the mean depth of the subsample. This information was not 

 entered when a surface grab sample or a short core sample was obtained; 

 for the latter the analysis of the subsample is assumed as representative 

 of the entire core length. 



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