GENERAL INSTRUCTIONS FOR CODING THE PHYSICAL AND CHEMICAL DATA FORM 



The following general instructions are to be applied when coding the 

 data form. 



1. Zeros are prefixed to numeric entries where necessary to fill a 

 field; however^ zeros should not be suffixed merely to fill a field. 



2. Whenever rounding is necessary, the following procedure is to be 

 used: 



> 5> 3.dd. one (l) to the preceding numeral 

 < 5^ drop 



5, round to nearest even numeral 



3. Generally, all shaded fields on the coding form are to be left 

 blank; these fields will be completed at the NODC, 



k. Arrange depths in order of descending depth; interfile depths from 

 overlapping casts if necessary. 



5- Question marks for doubtful data can be entered only in Columns 32, 

 37> ^2, and 53 of the Detail Card portion of the coding form. The originator 

 may, for record p\irposes, enter additional chemistry with a question mark; 

 however, doubtful additional chemistry cannot be punched. 



