In this photo provided by the Bureau of Land Management, researchers prepare fossils to be airlifted from the Rainbows and Unicorns Quarry on Grand Staircase-Escalante National Monument to the Paria River District paleontology lab in Kanab, Utah, on Sept. 4, 2018. Ferocious tyrannosaur dinosaurs may not have been solitary predators as long envisioned, but more like social carnivores such as wolves, new research unveiled Monday, April 19, 2021, found. (Dr. Alan Titus/Bureau of Land Management via AP)

In this photo provided by the Bureau of Land Management, researchers prepare fossils to be airlifted from the Rainbows and Unicorns Quarry on Grand Staircase-Escalante National Monument to the Paria River District paleontology lab in Kanab, Utah, on Sept. 4, 2018. Ferocious tyrannosaur dinosaurs may not have been solitary predators as long envisioned, but more like social carnivores such as wolves, new research unveiled Monday, April 19, 2021, found. (Dr. Alan Titus/Bureau of Land Management via AP)

Mass fossil site may prove tyrannosaurs lived in packs

A team of researchers determined that the dinosaurs died and were buried in the same place

Ferocious tyrannosaur dinosaurs may not have been solitary predators as long envisioned, but more like social carnivores such as wolves, new research unveiled Monday found.

Paleontologists developed the theory while studying a mass tyrannosaur death site found seven years ago in the Grand Staircase-Escalante National Monument in southern Utah, one of two monuments that the Biden administration is considering restoring to their full size after former President Donald Trump shrunk them.

Using geochemical analysis of the bones and rock, a team of researchers with the University of Arkansas determined that the dinosaurs died and were buried in the same place and were not the result of fossils washing in from multiple areas.

The new Utah site is the third mass tyrannosaur grave site that’s been discovered in North America — bolstering a theory first developed 20 years ago that they lived in packs. However, more research needs to be done to make that argument, said Kristi Curry Rogers, a biology professor at Macalester College who wasn’t involved in the research but reviewed the finding Monday.

“It is a little tougher to be so sure that these data mean that these tyrannosaurs lived together in the good times,” Rogers said. “It’s possible that these animals may have lived in the same vicinity as one another without travelling together in a social group, and just came together around dwindling resources as times got tougher.”

In 2014, Bureau of Land Management paleontologist Alan Titus discovered the site, which was later named the Rainbows and Unicorns quarry because of the vast array of fossils contained inside. Excavation has been ongoing since the site’s discovery because of the size of the area and volume of bones.

“I consider this a once-in-a-lifetime discovery for myself,” Titus told reporters during a virtual news conference. “I probably won’t find another site this exciting and scientifically significant during my career.”

The social tyrannosaurs theory began over 20 years ago when more than a dozen tyrannosaurs were found at a site in Alberta, Canada. Another mass death site in Montana again raised the possibility of social tyrannosaurs. Many scientists questioned the theory, arguing that the dinosaurs didn’t have the brainpower to engage in sophisticated social interaction, Titus said.

“Going that next step to understand behaviour and how animals behave requires really amazing evidence,” Joseph Sertich, curator of dinosaurs at the Denver Museum of Nature & Science, said at the news conference. “I think that this site, the spectacular collection of tyrannosaurs but also the other assembled pieces of evidence … pushes us to the point where we can show some evidence for behaviour.”

In addition to the tyrannosaurs, researchers have also found seven species of turtles, multiple fish and ray species, two other kinds of dinosaurs and a nearly complete skeleton of a juvenile Deinosuchus alligator. These other animals do not appear to have all died together.

Paleontology groups have been among those pushing the federal government to restore the Bears Ears National Monument and Grand Staircase-Escalante to their original sizes to protect the region’s rich paleontological and archaeological record.

Interior Secretary Deb Haaland visited southern Utah earlier this month as she prepared to submit recommendations on whether to reverse Trump’s decision to downsize the monuments. Titus said he showed Haaland some of the fossils at his lab during her visit and said she “appreciated getting to see the material.”

“The (Bureau of Land Management) is protecting these fossils as national treasures.” Titus said. “They’re part of the story of how North America came to be and how ultimately we came to be.”

___

Eppolito is a corps member for the Associated Press/Report for America Statehouse News Initiative. Report for America is a non-profit national service program that places journalists in local newsrooms to report on undercovered issues.

Sophia Eppolito, The Associated Press


Like us on Facebook and follow us on Twitter.

Wildlife

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

Creston Town Hall. (Photo by Kelsey Yates)
Ellen Tzakis resigns from Creston Town Council

Council is preparing to hold a by-election later this year

RCMP are searching for Philip Toner, who is a 'person of interest' in the investigation of a suspicious death in Kootenay National Park last week. Photo courtesy BC RCMP.
Man sought in suspicious Kootenay death found in Lake Country

Philip Toner is a person of interest in the death of Brenda Ware

A health-care worker prepares a dose of the Pfizer-BioNTech COVID-19 vaccine at a COVID-19 vaccine clinic in Toronto on Thursday, January 7, 2021. THE CANADIAN PRESS/Nathan Denette
65 new cases of COVID-19 in Interior Health

Overall, B.C. is seeing a decrease in COVID-19 cases

School District 8 employees Shannon Tetz, Cheryl Rendek, and Janet Wall officially began their retirement with a COVID-friendly send-off outside of Prince Charles Secondary School. (Photo by Kelsey Yates)
School District 8 employees Shannon Tetz, Cheryl Rendek, and Janet Wall officially began their retirement with a COVID-friendly send-off outside of Prince Charles Secondary School. (Photo by Kelsey Yates)
Three women retire from School District 8 with COVID-friendly celebration

Shannon Tetz, Cheryl Rendek, and Janet Wall shared 87 years of service collectively

The Salmo Public Library’s director Taylor Caron with her award. Photo: Submitted
Salmo Public Library director wins provincial award

Taylor Caron has been recognized by her peers for innovation and advocacy

B.C. Labour Minister Harry Bains in the B.C. legislature, May 13, 2019. (Hansard TV)
VIDEO: B.C. to provide 3 days of sick pay for COVID-19 absences

Province will support employers on cost, labour minister says

The RCMP logo is seen outside Royal Canadian Mounted Police “E” Division Headquarters, in Surrey, B.C., on Friday April 13, 2018. Indigenous leaders are calling for an investigation into the conduct of Mounties on Vancouver Island after two police shootings of members of a small First Nations community in three months. THE CANADIAN PRESS/Darryl Dyck
Indigenous leaders call for clarity, investigation into RCMP after B.C. shooting

The RCMP declined to comment on the requests by Indigenous leaders

Colleen Price, Vancouver Island University’s bachelor of science in nursing program chairperson, says she is impressed with how students have persevered through the COVID-19 pandemic. (Chris Bush/News Bulletin)
Next generation of B.C. nurses already showing resilience

University program head says learning had to be adjusted amidst pandemic

Two-year-old Kashius Weme rides at the Steve Smith Memorial Bike Park in Nanaimo on Tuesday, May 11. The youngster’s precocious bike-riding ability is already attracting cycle sponsors. (Chris Bush/News Bulletin)
2-year-old B.C. bike rider already attracting cycle sponsors

Nanaimo’s Kashius Weme has a knack for extreme cycle sports

Keith MacIntyre - BC Libertarian
Penticton’s Keith MacIntyre new leader of the B.C. Libertarian Party

The Penticton businessman was voted in by members of the party on May 8

Cannabis bought in British Columbia (Ashley Wadhwani/Black Press Media)
Is it time to start thinking about greener ways to package cannabis?

Packaging suppliers are still figuring eco-friendly and affordable packaging options that fit the mandates of Cannabis Regulations

Vernon North Okanagan RCMP reported to 287 mental health calls between Jan. 1, 2021, and May 1. (Black Press files)
‘It’s not the police’s responsibility to deal with mental health calls’: Vernon RCMP

RCMP remind public to take care of mental health and well-being, while better solutions are sought

Thompson Rivers University campus is in Kamloops, B.C. (KTW file photo)
Thompson Rivers the 1st B.C. university to supply free menstrual products

The university will offer the products this September

Fraser Health is using ‘targeted’ vaccination clinics in high-risk areas of the Lower Mainland. (Fraser Health photo)
B.C.’s COVID-19 decrease continues, 515 new cases Tuesday

426 seriously ill people in hospital, up from 415 Monday

Most Read