http://images.google.com/imgres?imgurl=http://seeps.geol.ucsb.edu/images/pictures/geology_images/isopach_fast.jpg&imgrefurl=http://seeps.geol.ucsb.edu/pages/isopach.html&h=337&w=512&sz=40&hl=en&start=5&tbnid=i-weWZiQqQylKM:&tbnh=86&tbnw=131&prev=/images%3Fq%3Disopach%26gbv%3D2%26hl%3DenThe above is a map with isopach of Holocene Overburden. According to the above website "the rainbow contours correspond to thickness of overburden sediment on the ocean floor..." A map with isopach shows rock and sediment thickness.
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