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Over time layers of sediment or rock accumulate on top of older layers, making a vertical slice through a system like the Grand Canyon somewhat like a timeline of the past, with the most recent layers on top. Based on the new maps, MBARI scientist Charlie Paull thinks there is visible evidence of such geological processes in the Campeche Escarpment, where exposed layers represent deposits from before, during and after the impact. Images from MBARI even show the spot where Paull and colleagues think layers from Cretaceous age meet younger sediments deposited after the impact event.