The color of sediments within a core is important because it can tell scientists a great deal about the source of these sediments. Cores are X-radiographed in a similar manner to how X-rays are
taken of a broken leg or rib. These X-rays allow scientists to literally look into the sediment and determine the type of processes that were involved in its deposition. Two aspects of this slide should be noted. First, observe the abruptness of the
transition between darker and lighter segments towards the bottom of the image; this section of core is from the base of H-1, about 14,500 yr. BP. Secondly, notice the large masses in the top third, lighter part of the image. These are ice rafted
detritus clasts, coarse-grained sediments deposited on the ocean floor by melting icebergs.
Bedford Institute of Oceanography and Dalhousie University
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