Abstract
Arising from R. N. Melchor, S. De Valais & J. F. Genise Nature 417, 936–938 (2002)10.1038/nature00818
Bird-like tracks from northwest Argentina have been reported as being of Late Triassic age1. They were attributed to an unknown group of theropods showing some avian characters. However, we believe that these tracks are of Late Eocene age on the basis of a new weighted mean 206Pb/238U date (isotope dilution–thermal ionization mass spectrometry method) on zircons from a tuff bed in the sedimentary succession containing the fossil tracks. In consequence, the mentioned tracks are assigned to birds and its occurrence matches the known fossil record of Aves.
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Change history
08 August 2013
Original paper, Nature 417, 936-938 (2002), has now been retracted.
References
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R.N.M. conducted project planning, geological constraints and tuff sampling. R.B. and S.B. carried out laboratory work, data analysis and presentation.
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Melchor, R., Buchwaldt, R. & Bowring, S. A Late Eocene date for Late Triassic bird tracks. Nature 495, E1–E2 (2013). https://doi.org/10.1038/nature11931
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DOI: https://doi.org/10.1038/nature11931
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