It's a gigantic discovery, 125 million years in the making.
David Elliott is a field palaeontologist and was mustering sheep in western Queensland when he stumbled across some small bones in 2005.
He says they turned out to be something much bigger.
"I thought it was a Theropod dinosaur actually I thought it looked like a bit of a limb bone, and I was really excited about it, it turned out to be a Sauropod. It is a totally new species of Sauropod and it's quite unlike most of the other ones around the world, it's very different so very pleased about that."
It took ten years of excavation to reveal one of the most complete dinosaur skeletons ever found in Australia.
Half the length of a basketball court, the dinosaur has hips a metre wide.
A scientific journal, Nature, has recognised the discoverer by naming it Savannasaurus elliottorum.
Dr Stephen Poropat is a vertebrate palaeontologist involved in the project.
"I guess what we're doing is piecing together bits of the past and just bringing to light something that no one has ever even conceived before in this country. We get a much better idea of the overall fauna and as a result we can start piecing together how climate affected these dinosaurs."
Geologists say they are excited about the discovery because it helps them to fill in the blanks about the unique journey of Australia's dinosaurs.
Melissa Murray is a geologist at the Australian Museum in Sydney.
"The links between our Australian dinosaurs and those that were found in Asia and in South America as well, and we can see that's the path they've most likely taken."
Ms Murray says Savannasaurus's discovery could also help to inspire a new generation of pre-ancient historians.
"Well that's the exciting thing isn't it? There is so much more to know. So all those kids out there who dream of being a paleontologist - you don't have to travel to North America, we have dinosaurs here in Australia!"
