Dinosaur bones around 97 million years old have been found in south-west Queensland.

Palaeontologists uncovered the bones and plant fossils at a sheep and cattle station near Eromanga.

The dinosaur awaits official identification but is believed to be a species of the long-necked sauropod.

In the meantime, it has been nicknamed Zac.

The sheep and cattle station already boasts Australia's largest dinosaur, Cooper, a new titanosaur species, measuring about 26 to 28 metres long.

He was discovered in a previous expedition.

Queensland Museum palaeontologist Scott Hocknull said although smaller than Cooper, Zac's skeleton was more complete.

He said he believed the discovery to be one of the most exciting in the region.

"The discoveries made this year confirm the site is likely to be of great significance, not only for Australia, but for a wider scientific understanding of the age of dinosaurs," Mr Hocknull said.

Other discoveries in the region include a long-necked plant-eating sauropod, Rhoetosaurus, found in the 1930s at Roma and believed to be 170 million years old.

Winton is also known for harbouring many dinosaur fossils with some dating from 98-95 million years ago.

Banjo (a carnivorous theropod), Matilda and Clancy (giant plant-eating sauropods) were found in a vast geological deposit near Winton that dates from 98 million years ago.

- AAP