Abstract
Evidence for the initiation of glacial ice-rafting, and for the development of sea-ice cover has been found in sediment cores from the central Arctic Ocean spanning early Pliocene (∼4.5 Myr BP) to Recent time. The glacial evidence reported here includes ice-rafted quartz grains, exhibiting glacially formed surface features, and benthic foraminifera endemic to continental shelves in core sediments from the Alpha Rise. The oldest evidence of ice-rafting occurs in sediments palaeomagnetically dated at ∼4.5 Myr BP. Variations in sediment facies indicate varying climatic regimes, and degrees of icecover in the Arctic Ocean since early Pliocene time.
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Margolis, S., Herman, Y. Northern Hemisphere sea-ice and glacial development in the late Cenozoic. Nature 286, 145–149 (1980). https://doi.org/10.1038/286145a0
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DOI: https://doi.org/10.1038/286145a0
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