II. CORE COLLECTION 



Thirty-five sediment cores were collected from eight different areas of the 

 continental shelf, continental slope, and deep-sea floor in the North Atlantic 

 Ocean, West Mediterranean Sea, and Central Pacific Ocean (Fig. 1). Relation 

 of cores within each area is shown in Figure 2; geographic coordinates cannot be 

 published at this time. 



Table 1 summarizes the equipment used to obtain the cores, sonic depth of 

 water, and pertinent information about each core. The name of the corer refers to 

 the U.S. Hydrographic Office (1955, p. 54-66) model of corers originally designed 

 or described by Kullenberg (1947), Ewing (Heezen, 1952), and Phleger (Phleger and 

 Parker, 1951, p. 3-5). The Hydroplastic corer was developed in the Hydrographic 

 Office for use in this program (Richards, 1960; Richards and Keller, 1961). 



The gross recovery ratio (Hvorslev, 1949, p. 100), R g/ listed in Table 1 is 

 related to the distance from the top of the core to the core nose cutting edge, Lg, 

 and the penetration of the corer, H, by 



R g " "FT (1) 



This ratio is assumed to be 100 percent for piston cores. For gravity cores, the 

 gross recovery ratio appears dependent on the clearance and area ratios of the corer 

 (part one). In Table 1, this ratio is based on the extreme condition that core shorten- 

 ing is the same throughout the length of the core and that core penetration equals 

 corer penetration. A further discussion of the problem has been given in part one. 



No corrections for core shortening are applied to the data presented. For each 

 and every core, the distance given in tables and graphs is the distance from the top 

 of the core measured in the laboratory. 



Hvorslev (1949, p. 105-109) defined ratios affecting performance of corers as 



c, - ^^. (2) 



where Cj is the inside clearance ratio that controls inside friction, D s is the minimum 

 inside diameter of the core barrel or liner, and D e is the minimum inside diameter of 



