Ninety-five million years ago, ocean bottom waters were much warmer than at present. Some of this warmth could have come from the proto-North Atlantic's continental shelves after the balmy surface waters became increasingly salty through evaporation.
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Voigt, S. Saline water sinking. Nature Geosci 1, 423–424 (2008). https://doi.org/10.1038/ngeo243
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DOI: https://doi.org/10.1038/ngeo243