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Paleontologists study rare pterosaur fossils using a 3D model

Paleontologists have found rare winged-reptile fossils, and 3D technology has helped them to study the pterosaur in “exquisite” detail.

The site was discovered by paleontologists while they were looking for fossil tracks in the rugged desert of northeastern Utah, not far from the dinosaur national monument, according to Brooks Britt, a professor at Brigham Young University (BYU).

While pulling themselves over a sandstone ledge adjacent to a precarious cliff the researchers saw delicate bones in the rock at the site known as Saints and Sinners, which was excavated over a period of several years, according to Britt who’s studying the fossils.

The bones belong to the pterosaur, or winged reptile, which is named Caelestiventus hanseni, according to Britt. This particular species isn’t a bird or a dinosaur but it has wings that are 5 feet long, Britt said.

“The fossil bones are so abundant that we cut out blocks of the sandstone weighing over 100 kilos with concrete-cutting chainsaws,” Britt said.

The group worried that they could break the bones, so they used an ultra-high resolution CT scanner to scan the bones. With the modern technology of 3D, they got the shape of this pterosaur without having to disturb it.

Britt called the 3D technology “crucial and revolutionizing.”

“One of the main points of this study is that the specimen is preserved in 3D. Most Triassic pterosaurs are severely crushed,” Britt said. “Ours was preserved in sandstone, protecting it from the crushing forces of being buried under thousands of feet of rock through geologic time.”

PHOTO: A 3D printed model of Pterosauria Skull.Nate Edwards/BYU
A 3D printed model of Pterosauria Skull.

The scanner used by the team works like those in a hospital but with higher energy X-rays and greater resolution, Britt explained. He went on saying that most scans consist of thousands of digital slices.

“Using software called Dragonfly, we identify the bone on each slice in a process called ‘segmentation,'” Britt said. “This software gives us 3D images which we can view on the computer or print out using a very high-resolution 3D printer.”

The dramatic improvement of the 3D printer has given them the ability to print “exquisite details,” according to Britt.

“Its three-dimensional bone preservation allows new insights into the structure of early pterosaurs not previously possible as most other finds are severely flattened/crushed,” he added.

The pterosaur fossil dates “back more than 200 million years,” according to a statement from BYU.

“Most Triassic specimens consist of just a single bone: for example, a little phalanx from a finger or one vertebra from the neck,” Britt said in a statement. “For this animal, we have the sides of the face and the complete roof of the skull, including the brain case, complete lower jaws and part of the wing.”

Caelestiventus is among the earliest known pterosaurs and shows even early forms were taxonomically and ecologically diverse, and it predates all known desert-dwelling pterosaurs by 65 million years, according to Britt.

It is closely related to the Dimorphodon macronyx from Lower Jurassic strata of Britain, Britt said.

PHOTO: An artists impression of Caelestiventus hanseni.Michael Skrepnick
An artists impression of Caelestiventus hanseni.

The bones are now in the Museum of Paleontology at Brigham Young University, according to Britt, where his team is studying it in great detail.

“We will continue to study them,” Britt said, “and they will be on display in the near future.”

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