Evidence for glaciation in the Northern Hemisphere back to 44 Ma from ice-rafted debris in the Greenland Sea |
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| Authors: | Aradhna K Tripati Robert A Eagle Andrew Morton Julian A Dowdeswell Katie L Atkinson Yannick Bahé Caroline F Dawber Emma Khadun Ruth MH Shaw Oliver Shorttle Lavaniya Thanabalasundaram |
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| Institution: | 1. Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;2. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;3. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0244, USA;4. School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes MK7 6AA, UK |
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| Abstract: | The widely accepted age estimate for the onset of glaciation in the Northern Hemisphere ranges between 2 and 15 million years ago (Ma). However, recent studies indicate the date for glacial onset may be significantly older. We report the presence of ice-rafted debris (IRD) in ～ 44 to 30 Ma sediments from the Greenland Sea, evidence for glaciation in the North Atlantic during the Middle Eocene to Early Oligocene. Detailed sedimentological evidence indicates that glaciers extended to sea level in the region, allowing icebergs to be produced. IRD may have been sourced from tidewater glaciers, small ice caps, and/or a continental ice sheet. |
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