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Tyrannosaur trackway from Maastrichtian of Wyoming

Ben Creisler

A new paper:

Sean D. Smith, W. Scott Persons IV & Lida Xing (2016)
A tyrannosaur trackway at Glenrock, Lance Formation (Maastrichtian), Wyoming.
Cretaceous Research 61:  1-4

During the Campanian and Maastrichtian ages (86–66 million years ago),
tyrannosaurids were the predominant large carnivorous dinosaurs
throughout the Northern hemisphere. Despite the abundance of skeletal
material, the fossil-footprint record of tyrannosaurids has been
limited. Here we report a tyrannosaurid trackway in the Lance
Formation, Wyoming. The trackway consists of three sequential tracks
on a sandstone surface. Based on the age and size of the footprints,
the trackmaker can be identified as either a sub-adult Tyrannosaurus
rex or a Nanotyrannus lancensis. The trackway offers a record of a
tyrannosaurid pace length, which permits the speed of the trackmaker
to be calculated at 4.5–8.0 km/h. This result discounts previous
speculation that tyrannosaurid walking speeds were notably slower than
those of other large theropods.