Heavy minerals, grain size distribution, and ice-rafted debris in the Greenland Sea during 44 to 30 Ma, supplement to: Tripati, Aradhna K; Eagle, Robert A; Morton, Andrew C; Dowdeswell, Julian A; Atkinson, Katie L; Bahé, Yannick; Dawber, Caroline F; Khadun, Emma; Shaw, Ruth M H; Shorttle, Oliver; Thanabalasundaram, Lavaniya (2008): Evidence for glaciation in the Northern Hemisphere back to 44 Ma from ice-rafted debris in the Greenland Sea. Earth and Planetary Science Letters, 265(1-2), 112-122

• Main Authors: Tripati, Aradhna K, Eagle, Robert A, Morton, Andrew C, Dowdeswell, Julian A, Atkinson, Katie L, Bahé, Yannick, Dawber, Caroline F, Khadun, Emma, Shaw, Ruth M H, Shorttle, Oliver, Thanabalasundaram, Lavaniya
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2008
• Subjects: Drilling/drill rig; Leg151; Joides Resolution; Ocean Drilling Program ODP; Atkinson; Greenland; Morton; Greenland Sea; Ice Sheet; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.707156; https://doi.pangaea.de/10.1594/PANGAEA.707156

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.