Featured Research

from universities, journals, and other organizations

Researchers Uncover New Burrowing Dinosaur

Date:
March 26, 2007
Source:
Emory University
Summary:
Paleontologists have uncovered the world's first fossil evidence of burrowing behavior in dinosaurs. The 95-million-year-old skeletal remains of the diminutive dinosaur -- along with the bones of two juveniles -- were found tucked into a fossilized chamber at the end of a sediment-filled burrow in southwestern Montana.

Paleontologists have uncovered the skeletal remains of 95-million-year-old burrowing dinosaurs.
Credit: Lee Hall: Montana State University

An Emory University paleontologist, collaborating with colleagues from Montana State University and Japan, has uncovered the world's first fossil evidence of burrowing behavior in dinosaurs. The study appears in the current Proceedings of the Royal Society B: Biological Sciences issue online.

The 95-million-year-old skeletal remains of the diminutive dinosaur -- along with the bones of two juveniles -- were found tucked into a fossilized chamber at the end of a sediment-filled burrow in southwestern Montana.

"The discovery represents the first scientific evidence that some dinosaurs not only dug burrows but also cared extensively for their young inside their dens," says Anthony Martin, senior lecturer in Emory's Department of Environmental Studies, of the newly named species of dinosaur, Oryctodromeus cubicularis, meaning "digging runner of the lair."

The discovery is reported by Martin and his colleagues, David Varricchio, of Montana State University, Bozeman; and Yoshihiro Katsura of Gifu Prefectural Museum in Japan. The study was funded by the Jurassic Foundation and the Department of Earth Sciences at Montana State University.

"The presence of an adult and two juveniles within a denning chamber represents some of the best evidence for dinosaur parental care," Varricchio says. "The burrow likely protected the adult and young Oryctodromeus from predators and harsh environmental conditions. Burrowing behavior may have allowed other dinosaurs to survive in extreme environments such as polar regions and deserts, and questions some end-Cretaceous extinction hypotheses."

The study notes that the dimensions of the burrowing tunnel and its end chamber were only slightly larger than the skeletal remains of the adult O. cubicularis, making it difficult for relatively large predators to enter the tunnel. Through computational analysis, the researchers estimated that the herbivorous dinosaur weighed between 22 kg and 32 kg, was 2.1 m long (about seven feet), including a 1.25 m tail, and had a trunk breadth of 26 cm to 30 cm. The juveniles were about 55 to 65 percent the size of the adult.

Because the burrow was filled with sediment, the researchers hypothesize that the dinosaurs had drowned after water breeched a nearby riverbank and flooded their den. The sediment, says Martin, helped preserve all three skeletons as well the burrow structure.

The dinosaur's functional morphology gleaned from its skeleton also confirms that O. cubicularis was both a seasoned digger and an accomplished runner. Oryctodromeus possessed several physical traits suited for digging: a modified snout that could be used as a shovel; large bony attachments in the shoulder to accommodate powerful muscles; and a robustly built hip that allowed for bracing during digging. In contrast to many modern digging animals, the dinosaur had long hind limbs and was well adapted for running on two legs.

In addition to the three dinosaurs found, the team also uncovered fossil evidence of other burrowing animals, most likely invertebrates, which lived alongside O. cubicularis. The finding reinforces the idea that the dinosaur was a burrower.

"As we dug, we found five or six small burrows coming off the main one, filled with the same sediment, which convinced me that this was a dinosaur burrow," says Martin. "Burrowing vertebrates often live in the same environment with burrowing bees, wasps or beetles."

Martin says he and his colleagues will return to Montana to see if they can find more burrows as previously uncovered fossil evidence indicates that other species of herbivorous dinosaurs often lived in nesting colonies.


Story Source:

The above story is based on materials provided by Emory University. Note: Materials may be edited for content and length.


Cite This Page:

Emory University. "Researchers Uncover New Burrowing Dinosaur." ScienceDaily. ScienceDaily, 26 March 2007. <www.sciencedaily.com/releases/2007/03/070325202715.htm>.
Emory University. (2007, March 26). Researchers Uncover New Burrowing Dinosaur. ScienceDaily. Retrieved October 2, 2014 from www.sciencedaily.com/releases/2007/03/070325202715.htm
Emory University. "Researchers Uncover New Burrowing Dinosaur." ScienceDaily. www.sciencedaily.com/releases/2007/03/070325202715.htm (accessed October 2, 2014).

Share This



More Fossils & Ruins News

Thursday, October 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Japan Celebrates 'bullet Train' Anniversary

Raw: Japan Celebrates 'bullet Train' Anniversary

AP (Oct. 1, 2014) A ceremony marking 50 years since Japan launched its Shinkansen bullet train was held on Wednesday in Tokyo. The latest model can travel from Tokyo to Osaka, a distance of 319 miles, in two hours and 25 minutes. (Oct. 1) Video provided by AP
Powered by NewsLook.com
Battle of New Orleans Cannon Gets New Carriage

Battle of New Orleans Cannon Gets New Carriage

AP (Sep. 30, 2014) A Spanish cannon used in the Battle of New Orleans and weighing nearly 3 tons was lowered Tuesday by pulleys, chains and muscle onto a new gun carriage like one that might have held it once aboard a navy ship. (Sept. 30) Video provided by AP
Powered by NewsLook.com
2,000 Year Old Pre-Inca Cloak on Display in Lima

2,000 Year Old Pre-Inca Cloak on Display in Lima

AFP (Sep. 27, 2014) A 2,000 year-old Pre-Inca cloak that is believed to represent an agricultural calendar of the Paracas culture is on display in Lima. Duration: 00:39 Video provided by AFP
Powered by NewsLook.com
Original Mozart Sonata Manuscript Found in Budapest

Original Mozart Sonata Manuscript Found in Budapest

AFP (Sep. 26, 2014) Considered lost for over two centuries, the original manuscript of one of the most famous works of Mozart's Sonata in A major has been uncovered in a library in Budapest. Duration: 01:04 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins