The Arizona Museum of Natural History and Virginia Tech announce the discovery and publication of a mid-Cretaceous Period tyrannosaur that significantly contributes to understanding tyrannosaur evolution. The find is important because of the scarcity of mid-Cretaceous deposits worldwide. Fossils from such rare deposits offer unique insights into the ancestors of the mighty dinosaurs of the end-Cretaceous. The find is announced and described today in the journal Nature Ecology and Evolution. Co-discoverer and lead author of!