Figure 4 in Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA

Figure 4. Pie chart of the time averaged census for largebodied dinosaurs from the entire Hell Creek Formation in the study area. Triceratops is the most common dinosaur at 40% (n = 72); Tyrannosaurus is second at 24% (n = 44); Edmontosaurus is third at 20% (n = 36) followed by Thescelosaurus at 8% (n = 15)ı Ornithomimus at 5% (n = 9)ı and Pachycephalosaurus and Ankylosaurus at 1% (n = 2). doi:10.1371/journal.pone.0016574.g004Published as part of John R. Horner, Mark B. Goodwin & Nathan Myhrvold, 2011, Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA, pp. 1-9 in PLoS ONE (e16574) 6 on page 7, DOI: 10.1371/journal.pone.0016574, http://zenodo.org/record/374491