Fossil of dinosaur swept away in ancient Australian river found

WASHINGTON (Reuters) – In sandstone next to the high tide mark at the edge of Bass Strait in southeastern Australia, scientists have unearthed fossils of a two-legged, turkey-sized, plant-eating dinosaur apparently swept away in a large, powerful ancient river.

Paleontologists on Thursday said the partial skeleton of the previously unknown beastie, named Diluvicursor pickeringi, that lived about 113 million years ago provides insight into the array of dinosaurs that inhabited Australia during the Cretaceous Period when it was still connected to Antarctica.

“Skeletons of dinosaurs from Australia are very rare,” said University of Queensland paleontologist Matthew Herne, noting that Diluvicursor brings to only 19 the number of Australian dinosaurs that have been named to date.

Artist’s impression of two Diluvicursor pickeringi foraging on the bank of a high-energy river within the Australian-Antarctic rift valley are seen in this image provided January 11, 2018. PeterTrusler/Handout via REUTERS

Diluvicursor’s remains were found amongst a jumbled collection of large fossilized tree trunks also apparently swept down the river during a flood. The site is on the south coast of the state of Victoria, about 105 miles from Melbourne.

Diluvicursor was about 7-1/2-feet long. Herne said it was “comparable to a large domesticated turkey in weight, but of course much longer than a turkey because of its tail.” The fossils included an almost complete tail, the lower part of the right leg and most of the right foot.

It lived alongside meat-eating dinosaurs about 20 feet long, as well as armored dinosaurs, turtles, shrew-sized mammals and flying reptiles called pterosaurs. Herne said Diluvicursor, a member of a dinosaur group called ornithopods, was similar to another small, two-legged herbivorous dinosaur called Leaellynasaura that lived at about the same time and whose remains were unearthed about 9 miles away.

The two may have occupied different ecological niches and eaten different plants. Leaellynasaura was more lightly built, had a longer tail and may have been a more agile runner.

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Largest Dinosaur print found

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People stand next to a footprint made by a meat-eating predator some 80 million years ago and one of the largest of its kind ever found, at the Maragua Syncline, Bolivia, July 20, 2016. REUTERS/David Mercado

Paleontologist Sebastian Apesteguia measures the footprint made by a meat-eating predator some 80 million years ago and one of the largest of its kind ever found, at the Maragua Syncline, Bolivia, July 21, 2016. REUTERS/David Mercado

Visitors look at dinosaur footprints while visiting with a tour guide the Cal Orcko cliff in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

Paleontologist Sebastian Apesteguia touches a dinosaur’s footprint at the Maragua Syncline, Bolivia, July 20, 2016. REUTERS/David Mercado

Visitors look at dinosaur footprints while visiting the Cal Orcko cliff in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado

A man walks next to dinosaur footprints at the Maragua Syncline, Bolivia, July 21, 2016. REUTERS/David Mercado

Visitors look at dinosaur footprints while visiting the Cal Orcko cliff in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado

Children play with the replica of a dinosaur fossil at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

A child walks up a playground climber with dinosaur footprints at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

A mother takes a photograph of her children while they pose in front of the replica of a Tyrannosaurus rex at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

Children have a snack while sitting next to the replica of a Tyrannosaurus rex at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

The replica of a Titanosaur is seen at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

Visitors walk underneath a replica of a Titanosaur at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

A visitor walks underneath a replica of a Titanosaur at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

The replica of a Titanosaur is seen at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

Visitors walk underneath a replica of a Titanosaur at the Cretaceous park in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado 

Paleontologist Sebastian Apesteguia measures the footprint made by a meat-eating predator some 80 million years ago and one of the largest of its kind ever found, at the Maragua Syncline, Bolivia, July 21, 2016. REUTERS/David Mercado

A truck unloads rocks next to the Cal Orko cliff where thousands of dinosaur’s footprints can be seen, in Cal Orcko, on the outskirts of Sucre, Bolivia, July 22, 2016. REUTERS/David Mercado

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“An analogy can be seen in the kind of diversity seen in the kangaroos and wallabies in present-day Australia who occupy very different niches, from open plains to dense forest habitats,” Herne said.

Diluvicursor roamed a forested broad rift valley floodplain between Australia and Antarctica, which remained connected until about 45 million years ago.

“The jury’s out on the climate,” Herne said. “Some believe that the climate was cold with winter ice, while others suggest the climate was warmer or more temperate.”

Its genus name, Diluvicursor, means “flood runner.” Its species name, pickeringi, honors the late paleontologist David Pickering.

The research was published in the scientific journal PeerJ.

(Reporting by Will Dunham; Editing by Sandra Maler)

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