Image: Upper Cretaceous Hell Creek dinosaur census

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Description: Pie chart of the time averaged census for large-bodied dinosaurs from the entire Hell Creek Formation in the study area (sampled near Fort Peck Reservoir in northeastern Montana). 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), Ornithomimus at 5% (n = 9), and Pachycephalosaurus and Ankylosaurus at 1% (n = 2).
Title: Upper Cretaceous Hell Creek dinosaur census
Credit: Horner JR, Goodwin MB, Myhrvold N (2011) Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA. PLoS ONE 6(2): e16574. doi:10.1371/journal.pone.0016574
Author: John R. Horner, Mark B. Goodwin, Nathan Myhrvold
Usage Terms: Creative Commons Attribution 2.5
License: CC BY 2.5
License Link: http://creativecommons.org/licenses/by/2.5
Attribution Required?: Yes

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