Evidence for European presence in the Americas in AD 1021.

@article{Kuitems2021EvidenceFE,
  title={Evidence for European presence in the Americas in AD 1021.},
  author={Margot Kuitems and Birgitta Linderoth Wallace and Charles R. Lindsay and Andrea Scifo and Petra Doeve and Kevin Jenkins and Susanne Lindauer and Pınar Erdil and Paul M. Ledger and V{\'e}ronique Forbes and Caroline Vermeeren and Ronny Friedrich and Michael W. Dee},
  journal={Nature},
  year={2021}
}
Transatlantic exploration took place centuries before the crossing of Columbus. Physical evidence for early European presence in the Americas can be found in Newfoundland, Canada1,2. However, it has thus far not been possible to determine when this activity took place3-5. Here we provide evidence that the Vikings were present in Newfoundland in AD 1021. We overcome the imprecision of previous age estimates by making use of the cosmic-ray-induced upsurge in atmospheric radiocarbon concentrations… 
4 Citations
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Disturbances in the radiocarbon record anchor a precisely dated archaeological stratigraphy of a medieval trading emporium in Denmark in time, revealing that the Viking expansion was associated with competition for trade routes rather than with raids.
Climate adaptation of pre-Viking societies

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