A Late Eocene date for Late Triassic bird tracks

Ricardo N. Melchor (), Robert Buchwaldt and Samuel Bowring
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Ricardo N. Melchor: INCITAP (CONICET-UNLPam), Av. Uruguay 151, 6300 Santa Rosa, La Pampa, Argentina
Robert Buchwaldt: Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA
Samuel Bowring: Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA

Nature, 2013, vol. 495, issue 7441, E1-E2

Abstract: 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.

Date: 2013
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DOI: 10.1038/nature11931

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