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Quantitative studies of the preservation and biogeographic distribution of calcareous nannofossils in Mid-Cretaceous sediments from the Atlantic are combined with observations on the temporal and spatial distribution of major facies patterns to put constraints on speculations about the paleoceanographic evolution of the Atlantic about 110 to 90 m.y.BP. Organic-rich sediments in deep ocean and continental margin settings are indicative of organic carbon influx from terrestrial and marine sources and considerable carbonate dissolution largely caused by carbon dioxide production during catabolic breakdown of organic matter. Preservation of organic carbon in sediments is the result of rapid burial, especially along continental...

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