Tool marks on an epic scale! Sonar reveals tracks of icebergs dragging over Arctic sea bed & other glacial features https://t.co/XnvRHLKDTp http://pic.twitter.com/XPFkzox6EK
— Chris Rowan (@Allochthonous) April 26, 2017
via Twitter https://twitter.com/Allochthonous
April 26, 2017 at 06:13PM
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