Riversleigh, in the north-west of Queensland, is part of Boodjamulla (Lawn Hill) National Park. It is Australia's most famous fossil site. The 100 km2 area has fossil remains of ancient mammals, birds and reptiles of Oligocene and Miocene age. What is so special about the fossils is that they are found in soft freshwater limestone which has not been compressed. This means the animal remains retain their three-dimensional structure. Riversleigh D Site, a small part of the area, is open to visitors. Riversleigh Fossil trail is an short and easy walk in which you pass some of the fossils. The Miyumba camping area close by is a quiet bushy camping area close to the Gregory river and away from the crowds.