A giant sauropod footprint from the Nemegt Formation (Upper Cretaceous) of Mongolia

An expedition to the Nemegt Formation in 2007 discovered new footprint sites at the Nemegt Locality. The sites contained natural-cast tracks identifiable as those of hadrosaurs, tyrannosaurs, and sauropods. Among the sauropod tracks was the best-preserved pes print yet described from the Late Cretaceous of Mongolia. The footprint is referred to Brontopodus sp. on the basis of footprint morphology, age, and potential trackmakers from the same formation. Size estimations based on the track indicate the trackmaker had an acetabular height of approximately 3.0-3.5 m. As such, the size of the trackmaker exceeds that of any Mongolian dinosaur yet reported from skeletal material.