204 



Fig. 3. Plot of coring stations in North Atlantic, 1947-53. 



5 9 - 



cone 172-9 10 Ma/ I SSI 

 Ull 19'485'N- Long 6l'll'W 

 FLAT FLOOR OF PUERTO RICO TRENCH 

 8430 ME TERS 



CORE IS* - •» // Jol/ 1951 



38'13'N ■ Long 70'5l'W 



WALL OF HUDSON CANYON 



3600 ME TERS 



Pull Out 



TENSION IN THOUSANDS OF POUNDS 



Fig. 4. Typical plot of wire tension during coring. 



mentation and the recovered longer cores 

 may not extend back through any greater 

 time sequence than some of the shorter 

 cores from other localities. 



The introduction of radiocarbon 

 dating of carbonate sediments requires 

 the development of a large diameter cor- 

 ing tube in order that larger volumes of 

 sediment may be sampled from each 

 horizon. At present the size of the 

 sample needed requires that several 

 inches of the 2|" diameter core be used. 

 This has obvious disadvantages since no 

 single layer can be dated. The major 

 problem of design in the construction of 



