Palaeobotanical evidence for a warm Cretaceous Arctic Ocean

THE Cretaceous period was a time of global warmth1–4. Mid-Cretaceous equatorial temperatures were similar to today's5, but the equator-to-pole temperature gradient is the subject of some controversy5–7. Although it is unlikely that the poles were ice-free8–10, fossil evidence3–5,11,12 indicates that near-polar temperatures were much higher than they are… CONTINUE READING

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