Mount Kirkpatrick holds one of the most important fossil sites in Antarctica, the Hanson Formation. Because Antarctica used to be warmer and supported dense conifer and cycad forest and because all the continents were fused into a giant supercontinent called Pangaea, many ancient Antarctic wildlife share relatives elsewhere in the world. Among these creatures are tritylodonts, herbivorous mammal-like reptiles that are prevalent elsewhere at the time. A crow-sized pterosaur has been identified. In addition to these finds, numerous dinosaur remains have been uncovered. Fossils of dinosaurs resembling Plateosaurus, Coelophysis, and Dilophosaurus were excavated. Mount Kirkpatrick holds the first dinosaur scientifically named on the continent: the large predatory Cryolophosaurus. In 2004, scientists have even found partial remains of a large sauropod plant-eating dinosaur.
Glacialisaurus hammeri, an herbivorous dinosaur thought to be around 25 feet (7.6 m) long and weighing perhaps 4-6 tons, was also identified from fossils on Mt. Kirkpatrick in 2007, the only known site of Glacialisaurus hammeri.