The Early Expression of Squamosal Horns and Parietal Ornamentation Confirmed by New End-Stage Juvenile Pachycephalosaurus Fossils from the Upper Cretaceous Hell Creek Formation, Montana

@article{Goodwin2016TheEE,
  title={The Early Expression of Squamosal Horns and Parietal Ornamentation Confirmed by New End-Stage Juvenile Pachycephalosaurus Fossils from the Upper Cretaceous Hell Creek Formation, Montana},
  author={M. B. Goodwin and D. Evans},
  journal={Journal of Vertebrate Paleontology},
  year={2016},
  volume={36}
}
  • M. B. Goodwin, D. Evans
  • Published 2016
  • Geology
  • Journal of Vertebrate Paleontology
  • ABSTRACT New end-stage juvenile specimens of Pachycephalosaurus from the Upper Cretaceous Hell Creek Formation, Montana, confirm the earliest expression of squamosal nodes, parietal ornamentation, and jugal morphology in the smallest and presumably youngest individuals yet known. High-resolution computed tomography of the slightly thickened, undomed parietal reveals a dense cortex, a highly cancellous interior of irregularly shaped erosion cavities, and bony trabeculae indicative of primary… CONTINUE READING
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