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Fossil Unearthed in New Mexico Years Ago Is Identified as T. Rex Relative

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Fossil Unearthed in New Mexico Years Ago Is Identified as T. Rex Relative


The Tyrannosaurus rex seemingly came out of nowhere tens of millions of years ago, with its monstrous teeth and powerful jaws dominating the end of the age of the dinosaurs.

How it came to be is among the many mysteries that paleontologists have long tried to solve. Researchers from several universities and the New Mexico Museum of Natural History and Science say they now have one more piece of the puzzle.

On Thursday, they unveiled fossil evidence and published their findings in the journal Scientific Reports. Their study identifies a new subspecies of tyrannosaur thought to be an older and more primitive relative of the well-known T. rex.

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There were oohs and ahs as the massive jaw bone and pointy teeth were revealed to a group of schoolchildren. Pieces of the fragile specimen were first found in the 1980s by boaters on the shore of New Mexico’s largest reservoir.

The identification of the new subspecies came through a meticulous reexamination of the jaw and other pieces of the skull that were collected over years at the site. The team analyzed the specimen bone by bone, noting differences in numerous features compared with those synonymous with T. rex.

“Science is a process. With each new discovery, it forces us to go back and test and challenge what we thought we knew, and that’s the core story of this project,” said Anthony Fiorillo, a co-author of the study and the executive director of the museum.

The differences between T. rex and Tyrannosaurus mcraeensis are subtle. But that’s typically the case in closely related species, said Nick Longrich, a co-author from the Milner Centre for Evolution at the University of Bath in the United Kingdom.

“Evolution slowly causes mutations to build up over millions of years, causing species to look subtly different over time,” he said.

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The analysis suggests the new subspecies Tyrannosaurus mcraeensis was a side-branch in the species’ evolution, rather than a direct ancestor of T. rex.

The researchers determined it predated T. rex by up to 7 million years, showing that tyrannosaurs were in North America long before paleontologists previously thought.

T. rex has a reputation as a fierce predator. It measured up to 40 feet (12 meters) long and 12 feet (3.6 meters) high. Study co-author Sebastian Dalman and the other researchers say T. mcraeensis was roughly the same size and also ate meat.

Thomas Richard Holtz, a paleontologist at the University of Maryland who was not involved in the study, said the tyrannosaur fossil from New Mexico has been known for a while but its significance was not clear.

One interesting aspect of the research is that it appears T. rex’s closest relatives were from southern North America, with the exception of Mongolian Tarbosaurus and Chinese Zhuchengtyrannus, Holtz said. That leaves the question of whether these Asian dinosaurs were immigrants from North America or if the new subspecies and other large tyrannosaurs were immigrants from Asia.

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“One great hindrance to solving this question is that we don’t have good fossil sites of the right environments in Asia older than Tarbosaurus and Zhuchengtyrannus, so we can’t see if their ancestors were present there or not,” Holtz said.

He and the researchers who analyzed the specimen agree that more fossils from the Hall Lake Formation in southern New Mexico could help answer further questions.



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New Mexico

Valencia County first responders busy with UTV crashes

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Valencia County first responders busy with UTV crashes


VALENCIA COUNTY, N.M. – Valencia County Fire Department responded to a serious UTV crash after two people suffered major injuries in the Rio Puerco area.

The Valencia County Fire Department one patient was flown to the hospital with critical injuries. A second patient went by ambulance with serious injuries.

The fire department said this was the second serious ATV or UTV crash its crews handled that day.

Earlier in the day, units responded to an ATV crash that sent two children to the hospital with multiple traumatic injuries.

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The fire department urged riders to wear helmets, stay off roadways and make sure children do not operate ATV or UTV vehicles without supervision.



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Nine New Mexico women allege brain tumors from injectable birth control in lawsuit

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Nine New Mexico women allege brain tumors from injectable birth control in lawsuit





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New Mexico

Land prices soar along High Road to Taos, spurring concerns of cultural loss

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Land prices soar along High Road to Taos, spurring concerns of cultural loss


Descending the sloping grasslands toward his livestock, Ronald Mascareñas reflected on the bygone days when nearly all the pastures in this lush community were thronged with cattle or sheep and neighbors banded together for a yearly ditch cleaning.

But as the cost of land in these villages in the Sangre de Cristo Mountains rises and more transplants move in — and a younger generation of locals moves out — he sees fewer people practicing a hard-toiling, rural lifestyle along the High Road to Taos.







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The mountain village of Truchas is one Northern New Mexico community concerned about gentrification and the ongoing housing trends pricing locals out.


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‘Affordability for people’







David Cordova

David Cordova

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‘Hard to maintain’



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A sign from luxury real estate broker Sotheby’s advertises a home for sale in the village of Truchas on Thursday.


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‘Way over market’

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Sahd’s hardware store owner and Peñasco fire chief Randy Sahd inside the family-owned and operated business on Thursday in Peñasco. “We’ve become a bedroom community for Los Alamos and Santa Fe,” Sahd said, remarking on the increasing cost of land and properties in the community.

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The family-owned and operated Sahd’s hardware store in Peñasco has served the mountain village of roughly 500 for over 50 years.


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Embracing outsiders?

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The mountain village of Truchas is one Northern New Mexico community concerned about gentrification and the ongoing housing trends pricing locals out.


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Can’t keep kids local



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Rancher and Taos County Commissioner Ronald Mascareñas returns home after feeding his cattle Thursday in Llano.


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