Australian palaeontologists say they have discovered a new species of dinosaur on a sheep farm in the northern state of Queensland. The fossil remains of the large plant-eating sauropod, nicknamed Zac, are about 97 million years old. They were found near the town of Eromanga, in a fossil-rich area that was once covered by a vast inland sea. Three new dinosaur species were found in the same area earlier this year, all dating to the same period as Zac � about 100 million years ago in the Early Cretaceous period.