May. 27th, 2014

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An exposed slab of late Jurassic mudstone north of Moab, Utah reveals a unique scene of a potential interaction between a few dinosaurs. A large sauropod, possibly a Camarasaurus, turns mid-stride, apparently reacting to a smaller theropod running nearby. A few yards away, an Allosaurus leaves the site with an irregular stride, possibly the result of a limp. Was this a site where an adult Allosaurus and a juvenile tried to tackle a Camarasaurus and were driven off after a conflict? Or was the smaller theropod running past after something else that caused the Camarasaurus to turn and watch it warily as it ran by? There's no way for us to know what the order of these events were, or what even the exact event was, but it lends nicely to some interesting speculation.

Below, photos of the trackway from my visit this morning. )

I will be home tomorrow, so soon we will be back to my regular level of detail in these drawings, or so I hope!

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Lauren Helton

September 2014

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