New Finds of Stegosaur Tracks from the Upper Jurassic Lourinhã Formation, Portugal

@inproceedings{Mateus2011NewFO,
  title={New Finds of Stegosaur Tracks from the Upper Jurassic Lourinh{\~a} Formation, Portugal},
  author={Octávio Mateus and Jesper Mil{\`a}n and Michael A. Romano and Martin A. Whyte},
  year={2011}
}
Eleven new tracks from the Upper Jurassic of Portugal are described and attributed to the stegosaurian ichnogenus Deltapodus. One track exhibits exceptionally well-preserved impressions of skin on the plantar surface, showing the stegosaur foot to be covered by closely spaced skin tubercles of ca. 6 mm in size. The Deltapodus specimens from the Aalenian of England represent the oldest occurrence of stegosaurs and imply an earlier cladogenesis than is recognized in the body fossil record. 

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