ALL NEWS

Mass fossil site may prove tyrannosaurs lived in packs

Apr 20, 2021, 7:27 AM
tyrannosaurs packs...
This photo provided by the Bureau of Land Management shows a "Hollywood" dinosaur specimen that was discovered approximately two miles north of the Rainbows and Unicorns Quarry on Grand Staircase-Escalante National Monument in Utah on Feb. 26, 2019. 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)
(Dr. Alan Titus/Bureau of Land Management via AP)

SALT LAKE CITY (AP) — The ferocious tyrannosaurs dinosaurs may not have been solitary predators as long envisioned, but more like social carnivores that moved in packs 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 traveling 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 behavior 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 behavior.”

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.

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)

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 nonprofit national service program that places journalists in local newsrooms to report on undercovered issues.

We want to hear from you.

Have a story idea or tip? Send it to the KSL NewsRadio team here.

Today’s Top Stories

All News

In the golden age of space exploration we live in, cosmic revelations seem to occur more frequently...
Ashley Strickland, CNN

Cosmic seaplanes and self-growing bricks could help us explore other worlds

In the golden age of space exploration we live in, cosmic revelations seem to occur more frequently than ever before.
1 day ago
The Chinese national flag is seen at the entrance to the Zhongnanhai leadership compound in Beijing...
By Zachary Cohen, CNN

A look at China’s history of spying in the US

The suspected Chinese surveillance balloon that violated American airspace this week has fueled a diplomatic crisis with the postponement of Secretary of State Antony Blinken's planned trip to Beijing.
1 day ago
Around 3:15 p.m. Saturday, February 4, a 34-year-old female sustained critical injuries after being...
Waverly Golden

AirMed responds to tubing accident in Peter Sinks, Logan

Around 3:15 p.m. Saturday, February 4, a 34-year-old female sustained critical injuries after being struck by a snowmobile.
1 day ago
A balloon flies in the sky over Billings, Montana, U.S. February 1, 2023, in this picture obtained ...
Zachary Cohen, CNN

US military has shot down the Chinese spy balloon off US East Coast, US official says

The US military has shot down the suspected Chinese surveillance balloon over the Atlantic Ocean off the Eastern Seaboard, a US official said Saturday.
1 day ago
The Goonies House...
Taylor Romine and Ralph Ellis, CNN

Man wanted for leaving a dead fish at ‘The Goonies’ house saved by Coast Guard in daring rescue

A man wanted by police in an incident at a house featured in "The Goonies" was the subject of a Coast Guard rescue when he was tossed from a stolen boat as it capsized, authorities said.
1 day ago
SLCPD said the driver is fully cooperating with the investigation and the children received non-lif...
Chandler Holt

SLCPD makes arrest connected to fatal stabbing case

SLCPD announced the arrest of 26-year-old Ivy Chase Grant today. Grant was booked into Salt Lake County Metro Jail on a charge of obstruction of justice. 
1 day ago

Sponsored Articles

Banner with Cervical Cancer Awareness Realistic Ribbon...
Intermountain Health

Five Common Causes of Cervical Cancer – and What You Can Do to Lower Your Risk

January is National Cervical Cancer Awareness month and cancer experts at Intermountain Health are working to educate women about cervical cancer, the tests that can warn women about potential cancer, and the importance of vaccination.
Kid holding a cisco fish at winterfest...
Bear Lake Convention and Visitors Bureau

Get Ready for Fun at the 2023 Bear Lake Monster Winterfest

The Bear Lake Monster Winterfest is an annual weekend event jam-packed full of fun activities the whole family can enjoy. This year the event will be held from January 27-29 at the Utah Bear Lake State Park Marina and Sunrise Resort and Event Center in Garden City, Utah. 
happy friends with sparklers at christmas dinner...
Macey's

15 Easy Christmas Dinner Ideas

We’ve scoured the web for you and narrowed down a few of our favorite Christmas dinner ideas to make your planning easy. Choose from the dishes we’ve highlighted to plan your meal or start brainstorming your own meal plan a couple of weeks before to make sure you have time to shop and prepare.
Spicy Homemade Loaded Taters Tots...
Macey's

5 Game Day Snacks for the Whole Family (with recipes!)

Try these game day snacks to make watching football at home with your family feel like a special occasion. 
Happy joyful smiling casual satisfied woman learning and communicates in sign language online using...
Sorenson

The Best Tools for Deaf and Hard-of-Hearing Workplace Success

Here are some of the best resources to make your workplace work better for Deaf and hard-of-hearing employees.
Team supporters celebrating at a tailgate party...
Macey's

8 Delicious Tailgate Foods That Require Zero Prep Work

In a hurry? These 8 tailgate foods take zero prep work, so you can fuel up and get back to what matters most: getting hyped for your favorite
Mass fossil site may prove tyrannosaurs lived in packs