8. 
vestigation of 2 cores from the Bermuda pedestal revealed tertiary sedi- 
ment. Ona subsequent cruise a number of cores were taken from the 
same general area and outcrops of other tertiary stages were found, 
(Ericson, Ewing, Heezen, 1952) 
Da 
The probable importance of turbidity currents as transporter |“ 
= 
of sediment into deep water was first indicated by a study of the relation- : hy 
— 
ship between sediment type and thaoaneiplty in the Hudson submarine can- 
yons region (Ericson, Ewing, Heezen, 1951). After a few cores indicated 
the probability that sands and gravel were limited to the canyon floor on / 
the continental rise and that normal clays were found in the inter canyon 
areas, about 30 cores were taken at topographic locations selected so as 
to confirm or refute the prediction. These cores not only confirmed the 
predicted occurrence but of 20 cores, taken on the same cruise in order 
to determine the possible existence of a delta, 18 contained sands thus 
confirming this additional prediction, 
The criginal puzpose of most core studies was the determination 
of a Pleistocene stretigraphy in marine sediments beneath deep water 
where it was supposed that only slow deposition occursed without inter- 
ference by erosion, slumping or periods of rapid deposition. The studies 
have demonstrated that while there are many areas where such undisturbed 
sedimentation occurs there are probably as many areas where it does not 
eccur. Therefore in order to obtain cores suitable for study of Pleisto- 
cene chronology cores must be taken from areas which seem promising 
in the light of the analyses of cores from previous cruises. 
