The Murgon site is important as the only site on the continent with a diverse range of vertebrate fossils dating from the early Paleogene Period (55 million years ago, only 11 million years after the extinction of the non-avian dinosaurs), making it a crucial period in mammal evolution.
It is also important in demonstrating Australia's Gondwanan links with South America in the form of similar fossils from the two continents.
The most common fossil at the site are of crocodiles and giant trionychidae turtles which have become extinct in Australia.
Vertebrae fossils recovered from the site have been tentatively attributed to salamanders, though their identity remains disputed.
Evidence of the Gondwanan connection comes with the appearance of a madstoiid snake in the genus Alamitophis, also found in Argentina, and of microbiotheriid marsupials, otherwise only known from South America.