Evidence for ephemeral middle Eocene to early Oligocene Greenland glacial ice and pan-Arctic sea ice.

Nat Commun · 2018 · PMC5847593 · PMID 29531221

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The first highly significant influx of ice-rafted Fe oxide grains (≥5 grains from 1 source) from Greenland indicates the presence of glacial ice at 43.6 Ma, followed by several notable peaks in fluxes through 26 Ma (Fig. 3 , Supplementary Data 2 ).

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