The Tasmanian fossil dicynodont tusk |
Yet there was a geographical problem with this: the only known Australian specimen was a single fragment of bone discovered 30 years ago in Queensland. If the dicynodonts were a global group, then why was there an extreme lack of evidence for their existence in Australia? The discovery of a single tusk from the island of Tasmania, now gives the dicynodont a geographical range of over 2000 kilometres down the east cost of the southern continent.
An artist's impression of the Tasmanian dicynodont, a cow sized animal which roamed the Triassic deserts of Pangaea |
The fossils were taken to the University of Tasmania for analysis. Where sedimentologist, Professor Stuart Ball, found that they predated the first dinosaurs by around 20 million years, making them a late Triassic species. It seems that the dicynodonts survived in Australia far longer than anywhere else on Earth, even out-running the Permian extinction itself. Ball believes that floods may have washed the remains of the dicynodonts into billabongs - large ponds of water - which would account for the apparent lack of fossils.