Dinosaurs are reptiles that went extinct 64 million years ago. They grew to gigantic sizes. They lived in a time when Australia was a very different place to what it is today, and part of the ancient landmass called Gondwana. The Eromanga dinosaurs are estimated to be 95-98 million years old and lived during the late Cretaceous.
Megafauna are the group of animals that evolved after the dinosaurs died. They were very large marsupials, reptiles and flightless birds and went extinct about 20,000 years ago. Some of their descendants still exist today in much smaller forms such as kangaroos, wombats, komodo dragons and crocodiles. The Eulo megafauna lived during Pleistocene approximately 50,000 to 100,000 years ago.