A new zygodactylid species indicates the persistence of stem passerines into the early Oligocene in North America

@article{Hieronymus2018ANZ,
  title={A new zygodactylid species indicates the persistence of stem passerines into the early Oligocene in North America},
  author={Tobin L Hieronymus and David A Waugh and Julia A. Clarke},
  journal={BMC Evolutionary Biology},
  year={2018},
  volume={19}
}
BackgroundThe lake deposits of the informal Ruby Paper Shale unit, part of the Renova Formation of Montana, have yielded abundant plant fossils that document Late Eocene – Early Oligocene global cooling in western North America. A nearly complete small bird with feather impressions was recovered from this unit in in 1959, but has only been informally mentioned.ResultsHere we describe this fossil and identify it as a new species of Zygodactylus, a stem lineage passerine with a zygodactyl foot… Expand
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