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smarl A pelagic or hemipelagic sediment (an arl), typically found interbedded with purer oozes in beds up to 1.5 m thick, with a composition intermediate between a non-biogenic sediment and a calcareous or siliceous ooze. It is 30% clay and 70% microfossils, with siliceous and calcareous microfossils present in approximately equal amounts. Compare MARL; and SARL.