A drowned Mesozoic bird breeding colony from the Late Cretaceous of Transylvania

  title={A drowned Mesozoic bird breeding colony from the Late Cretaceous of Transylvania},
  author={Gareth J. Dyke and M{\'a}ty{\'a}s Vremir and Gary W. Kaiser and Darren Naish},
Despite a rapidly improving fossil record, the reproductive biology of Mesozoic birds remains poorly known: only a handful of undisputed, isolated Cretaceous eggs (some containing embryonic remains) are known. We report here the first fossil evidence for a breeding colony of Mesozoic birds, preserved at the Late Cretaceous (Maastrichtian) Oarda de Jos (Od) site in the Sebeş area of Transylvania, Romania. A lens of calcareous mudstone with minimum dimensions of 80 cm length, 50 cm width and 20… 


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