Largest tyrannosaur bonebed

The Albertosaurus sarcophagus bonebed in Dry Island Buffalo Jump Provincial Park, Alberta, Canada, includes the remains of at least 12 (Eberth and Currie, 2010) and perhaps as many as 26 (Erickson et al. 2010) individual tyrannosaurs, ranging from adolescents to adults. Approximately 200 m2 (2,150 sq ft) have been excavated, and 1,500 specimens collected to date. This mass-death assemblage site is a key source of evidence for those who subscribe to the school of thought that supports pack behaviour in tyrannosaurs.

The site was first found on 10 August 1910 by a crew, led by famous palaeontologists Barnum Brown and Peter Kaisen, from the American Museum of Natural History, but not systematically excavated. The site was lost and then rediscovered in 1997 and systematically excavated for several years by the Royal Tyrrell Museum (1998-2005), and later the University of Alberta (2005-10).

Material from this site is housed at the Royal Tyrrell Museum in Drumheller, Alberta, Canada, with additional material at the American Museum of Natural History and the University of Alberta.