The World’s Oldest Owl: A New Strigiform from the Paleocene of Southwestern Colorado
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Smithsonian Institution Press
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Among the fossils recovered from a small, mid-Paleocene fissure filling in southwestern Colorado is the oldest known owl, Ogygoptynx wetmorei, new genus and species. This form, represented by a single tarsometatarsus, does not clearly belong in any of the known families of Strigiformes and may represent a new higher category of owls that provides a link between the Strigidae and the Tytonidae.
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Vickers-Rich, Patricia and Bohaska, David J. 1976. "<a href="https://repository.si.edu/handle/10088/117200">The World’s Oldest Owl: A New Strigiform from the Paleocene of Southwestern Colorado</a>." In <em>Collected papers in avian paleontology honoring the 90th birthday of Alexander Wetmore</em>. 87–93. Washington, D.C.: Smithsonian Institution Press. In <em> Smithsonian Contributions to Paleobiology</em>, 27. <a href="https://doi.org/10.5479/si.00810266.27.87">https://doi.org/10.5479/si.00810266.27.87</a>.