Largest dinosaur bones in Australia discovered

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Largest dinosaur bones in Australia discovered
Queensland Museum
May 3, 2007

The largest bones of any dinosaur known in Australia went on display at the Queensland Museum for the first time today.

Arts Minister Rod Welford said the internationally-significant fossils were the first dinosaur discovery in south-west Queensland and further excavations could uncover more.

"These two newly discovered dinosaur giants, nicknamed Cooper and George, were discovered near the town of Eromanga, 320km west of Charleville in November 2005 and April last year," Mr Welford said.

Found in the upper Winton Formation, known as the Cenomanian Epoch of the mid-Cretaceous Period, approximately 95-98 million years ago.

About 2 to 5 million years younger than the Winton dinosaurs (e.g. Elliot, Wade, Matilda), that come from the lower Winton Formation, known as the Albian Epoch of the mid-Cretaceous.

Cooper and George are titanosaur sauropods. Titanosaurs are one of the last remaining sauropod groups in the Cretaceous Period and also were the largest ever land-dwelling animals.

The bones of Cooper and George are the largest bones of any dinosaur so far discovered in Australia, which makes them the largest bones of any animal to have walked the Australian continent. The humerus is one of the most complete dinosaur bones known.

Based on the lengths of the humerus of Cooper and the femur of George, compared to dinosaurs from overseas, we can estimate the total body length of these dinosaurs to be 24 to 26m. Elliot, based on a single femur is estimated to about 18m, so between 6 to 8m shorter than it's southern Queensland relatives.

George and Cooper are only 20 to 30cm off being alongside world record holders, like Argentinosaurus and Paralititan found in Argentina and Africa respectively. Sauropod footprints in Broome, Western Australia, date from the Cretaceous Period and are of similar size to Cooper and George, with some of them possibly being among the biggest footprints in the world.

Titanosaurs have been found across the globe, however, little is known of the Australian dinosaur world.

All dinosaur discoveries found in Australia are most likely going to represent new species because so little has been found until now.

George and Cooper represent a new species, different to the species found in Winton.

This is the beginning of Australia's very own dinosaur-rush, something that happened more than 150 years ago in North America and Europe. Australia is now one of the last frontiers for dinosaur discovery and research.

"They are titanosaurs, which are plant-eating dinosaurs with extremely long necks and tails, massive bodies and elephant-like legs."

Titanosaurs are the largest land-dwelling animals ever identified and their fossils have been found in rocks of similar ages and geographic regions around the world that once made up Gondwana, including South America and North Africa.

Cooper and George are thought to be of a new species of the titanosaur group that lived more than 95 million years ago.

Curator of Geosciences at the Queensland Museum, Scott Hocknull, said Cooper and George were at least 6-7m longer than another well-known Queensland sauropod, Elliot, previously the largest bone of any dinosaur found in Australia.

"Cooper's right humerus weighs 100kg and is a rare complete bone measuring 1.5m in length," Mr Hocknull said.

The new fossil-rich sites are part of the Winton Formation, a large sequence of rocks from the age of the dinosaurs, which spans Queensland's interior.

At least seven sites have been identified from hundreds of bone fragments since the first fossil was uncovered in 2004. Many more sites on the property near Eromanga are still to be excavated.

Queensland Museum in conjunction with the Cooper/Eromanga Basin Natural History Society, which is sponsored by Santos, will conduct further excavations at the site in mid to late May.

The new dinosaur bones are on display now at the Queensland Museum exhibition Museum Zoo, currently on level 3 of the museum at South Bank.

This is a modified news release from the Queensland Museum

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CITATION:
Queensland Museum (May 03, 2007). Largest dinosaur bones in Australia discovered. http://news.mongabay.com/2007/0503-dinosaur.html

Tags:
Paleontology Australia Dinosaurs Fossils green

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