generally be sorted out at a given point of ambiguity, this interference 

 deteriorates the continuity of the overall view, and increases the diffi- 

 culty of comparative work. 



The problems of space and opposed headings can be partly resolved by 

 photographically reproducing records at a smaller scale. A more compre- 

 hensive method of achieving a manageable format is to "reduce" the records 

 to line profiles, such as sho\m in Figure A-4. This process consists of 

 delineating the acoustic interfaced lines on the record with pen, chalk 

 or some other marker and manually transferring these lines, point by point, 

 to a prepared graphic profile plot at reduced scale. In this process the 

 horizontal scale differences are resolved, all line directions are put in 

 the same sense, and the problem of multiple reflectors is eliminated. As 

 useful as this manner of presentation is, it would not do to rely entirely 

 on the line profiles since they do not show the character of the signal or 

 the finer details of line configuration. It is necessary then to refer 

 periodically to the original records, and for this purpose photographic 

 reproductions are very useful. 



b. Cores 



Processing of sediment cores at CERC consists primarily of 

 visual description and granulometric analysis of material. Representative 

 samples are selected along the core at points determined by visual in- 

 spection through the clear plastic core liner. A hole is drilled in the 

 liner at these points, and about 80 grams of material are removed after 

 which the core is resealed by filling the hole with expanding foam plastic 

 and wrapping with plastic tape. Each sample is inspected under a binoc- 

 ular microscope, and visually classified for color, texture, and gross 

 mineralogy. Granulometric analysis of all sand-sized material is made 

 with a modified Woods Hole-type rapid sediment analyzer (Ziegler, et al, 

 1960, and Schlee, 196 ), an instrument which provides size distribution 

 data related to hydraulic diameters of equivalent spheres. The size 

 analysis data is produced on both an analog recorder and on punched cards. 

 The cards are processed by computer for printout of granulometric statis- 

 tical measures such as mean diameter, median diameter, standard deviation, 

 skewness, and kurtosis. 



A-IO 



