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Yukon gold miner unearths a mummified Ice Age wolf pup – Ars Technica

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Enlarge / The puppy’s remains are dried out but mostly intact thanks to being buried in permafrost.

This Ice Age wolf puppy doesn’t look much like a fearsome predator, what with her tiny puppy teeth and soft little ears. According to her DNA, however, the mummified puppy, named Zhùr, came from a population that’s among the ancestors of all modern wolves. Canada’s permafrost freeze-dried her remains shortly after her death around 57,000 years ago.

“She’s the most complete wolf mummy that’s ever been found. She’s basically 100 percent intact—all that’s missing are her eyes,” said Des Moines University paleontologist Julie Meachen.

Puppy surprise

In July 2016, miner Neil Loveless of Favron Enterprises was searching for gold in Alaska’s famed Klondike gold fields. He was water-blasting the frozen mud along the banks of Last Chance Creek. It’s a process called “hydraulic thawing,” meant to thaw and soften the frozen permafrost so miners can search for gold in the streambed deposits, an approach called placer mining. But Loveless found something far stranger and even more interesting than Klondike gold: a frozen, mummified wolf puppy.

“We thank [Loveless] for his keen eye spotting Zhùr as she was melting out of the permafrost, ensuring she was kept safe in a freezer, and then reporting the discovery to Yukon Paleontology,” wrote Meachen and her colleagues in a recent paper in the journal Current Biology. Studying Pleistocene wildlife in the Yukon means working with gold-mining companies, whose workers might be the first to spot something like Zhùr. Scientists like Meachen also work very closely with the people who have called this region home for thousands of years, like the Tr’ondëk Hwëch’in First Nation.

Members of the group gave the puppy her name, Zhùr, which means “wolf” in the Hän language. Zhùr is a culturally significant find for the Tr’ondëk Hwëch’in, but they were also interested in how much the frozen puppy could teach us about Pleistocene wolves. The First Nation agreed to display the mummy at the Yukon Beringia Interpretive Center in Whitehorse, where she has been cleaned, conserved, and studied.

“We are grateful for the partnership with Tr’ondëk Hwëch’in in our shared role in protecting and preserving heritage resources in the Klondike,” wrote Meachen and her colleagues.

Taking tiny samples from a few of Zhùr’s incredibly well-preserved hair follicles, Meachen and her colleagues radiocarbon dated the frozen puppy and studied the chemical isotopes in her body, which offered clues about what she ate and the climate in which she lived. They also sequenced her mitochondrial DNA, the genetic material passed down directly from mother to offspring.

The ancestors of modern wolves

Zhùr probably lived around 57,000 years ago, but it took three different dating methods to figure that out.

Radiocarbon dating could only tell Meachen and her colleagues that the mummy was older than 50,000 years. The puppy’s genome suggested that she’d lived sometime between 75,000 and 56,000 years ago, based on the rate at which wolf DNA collects mutations over time. And the oxygen isotopes in her body suggested that she had lived during the relatively warm period of Marine Isotope Stage 3, when warmer conditions led to smaller ratios of the isotope oxygen-18 in marine sediment cores—and in Zhùr’s body. MIS 3 spanned a period 57,000 to 29,000 years ago.

All of those possible dates overlapped at one point: 57,000 to 56,000 years ago. At the time, sea levels were much lower than today, and a region of dry land called Beringia connected Siberia and Canada. Animals moved freely back and forth between the continents, which is why Pleistocene wolves unearthed across Eurasia and North America are all so closely related. Zhùr’s mitochondrial DNA fit right into that group of closely related animals, or clade, with a common ancestor that lived between 86,000 and 67,500 years ago.

Zhùr and her clade are the ancestors of every wolf in the world (except possibly the high-altitude Himalayan wolves, which have apparently been doing their own thing for hundreds of thousands of years, according to a study earlier in 2020).

But because mitochondrial DNA gets passed down directly from mother to puppy, Meachen and her colleagues could tell that Zhùr wasn’t a direct ancestor of the wolves that roam the Klondike today. Sometime in the last 56,000 years or so, the Klondike wolf population died out or left the area, and another group of wolves—one less closely related to Zhùr—replaced it. At the moment, there’s not enough data to tell if the newcomers drove off, outcompeted, or just absorbed Zhùr’s relatives, but the puppy’s DNA hints at an interesting story yet to be explored.

Wolves eat fish, too

If Zhùr couldn’t tell Meachen and her colleagues exactly what happened to a whole population of Klondike wolves, she could at least tell quite a bit of her own story. Based on how her bones had developed, the puppy was about 7 weeks old when she died. Since modern wolves in the area usually give birth in early summer, that means Zhùr probably died in July or early August, around the same time Loveless washed her out of the permafrost 57,000 years later.

By then, Zhùr’s mother had probably weaned her pups from milk and started bringing them real food. Modern wolf puppies start eating solid food at around 5 or 6 weeks old. In Zhùr’s case, that seems to have included a lot of fish, according to the amount of the isotope nitrogen-15 in her body. Nitrogen isotopes offer clues about how far up the food chain an animal might have been and whether more of its food came from land or water.

Given all the fish, the puppy’s breath must have been atrocious. “Normally, when you think of wolves in the Ice Age, you think of them eating bison or musk oxen or other large animals on land,” said Meachen. “One thing that surprised us was that she was eating aquatic resources, particularly salmon.”

Modern wolves in the Alaskan interior have been known to chow down on fish, at least in seasons when they’re readily available. And Zhùr’s den wasn’t far from the Klondike River, where Chinook salmon spawn today. The fish swim up the Yukon River to the Klondike, where they would have been a veritable buffet for a mother wolf looking to feed her pups.

How to freeze-dry an Ice Age predator

Obviously things didn’t end well for Zhùr, or we wouldn’t have a ridiculously adorable canid ice mummy to study today. Her burial can offer a few clues about her untimely end and her uncannily good preservation over the intervening millennia. She must have died in just the right conditions and been buried quickly—a rare combination. “The animal has to die in a permafrost location, where the ground is frozen all the time, and they have to get buried very quickly, like any other fossilization process,” said Meachen.

Animals that get killed by predators don’t tend to form perfectly preserved ice mummies, and animals that die from sickness or exposure also don’t tend to get buried quickly enough to freeze and mummify. And isotopic analysis suggests the puppy was well-nourished, so whatever happened, she probably wasn’t sick and definitely wasn’t starving.

Meachen and her colleagues think Zhùr’s den collapsed, killing her instantly and burying the remains in the freezing ground. “We feel a bit better knowing the poor little girl didn’t suffer for too long,” said Meachen.

There’s another question that Zhùr will never be able to answer, however: why was she alone in the den? Wolf mothers usually have four to six puppies at a time, but only Zhùr was buried alongside Last Chance Creek; no sign of her mother or littermates has turned up. “It could be that she was an only pup, or the other wolves weren’t in the den during the collapse,” said Meachen. “Unfortunately, we’ll never know.”

A cautionary tail

Permafrost mummies of large mammals, like mammoths, bears, and even wolves, are rare finds for paleontologists. But smaller ones, like ground squirrels and ferrets, turn up more often in places like Siberia and the Yukon. Meachen and her colleagues speculate that animals who lived in burrows or dens, including wolf pups, may have had better odds of getting preserved in the permafrost, especially if they died in cave-ins.

Even large permafrost mummy finds are getting more common, though. A cave bear emerged from the Siberian permafrost earlier this year, and it’s one of several recent finds. “One small upside of climate change is that we’re going to find more of these mummies as permafrost melts,” said Meachen. “That’s a good way for science to reconstruct that time better, but it also shows us how much our planet is actually warming.”

Current Biology, 2020 DOI: 10.1016/j.cub.2020.11.011 (About DOIs).

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Here’s how Helene and other storms dumped a whopping 40 trillion gallons of rain on the South

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More than 40 trillion gallons of rain drenched the Southeast United States in the last week from Hurricane Helene and a run-of-the-mill rainstorm that sloshed in ahead of it — an unheard of amount of water that has stunned experts.

That’s enough to fill the Dallas Cowboys’ stadium 51,000 times, or Lake Tahoe just once. If it was concentrated just on the state of North Carolina that much water would be 3.5 feet deep (more than 1 meter). It’s enough to fill more than 60 million Olympic-size swimming pools.

“That’s an astronomical amount of precipitation,” said Ed Clark, head of the National Oceanic and Atmospheric Administration’s National Water Center in Tuscaloosa, Alabama. “I have not seen something in my 25 years of working at the weather service that is this geographically large of an extent and the sheer volume of water that fell from the sky.”

The flood damage from the rain is apocalyptic, meteorologists said. More than 100 people are dead, according to officials.

Private meteorologist Ryan Maue, a former NOAA chief scientist, calculated the amount of rain, using precipitation measurements made in 2.5-mile-by-2.5 mile grids as measured by satellites and ground observations. He came up with 40 trillion gallons through Sunday for the eastern United States, with 20 trillion gallons of that hitting just Georgia, Tennessee, the Carolinas and Florida from Hurricane Helene.

Clark did the calculations independently and said the 40 trillion gallon figure (151 trillion liters) is about right and, if anything, conservative. Maue said maybe 1 to 2 trillion more gallons of rain had fallen, much if it in Virginia, since his calculations.

Clark, who spends much of his work on issues of shrinking western water supplies, said to put the amount of rain in perspective, it’s more than twice the combined amount of water stored by two key Colorado River basin reservoirs: Lake Powell and Lake Mead.

Several meteorologists said this was a combination of two, maybe three storm systems. Before Helene struck, rain had fallen heavily for days because a low pressure system had “cut off” from the jet stream — which moves weather systems along west to east — and stalled over the Southeast. That funneled plenty of warm water from the Gulf of Mexico. And a storm that fell just short of named status parked along North Carolina’s Atlantic coast, dumping as much as 20 inches of rain, said North Carolina state climatologist Kathie Dello.

Then add Helene, one of the largest storms in the last couple decades and one that held plenty of rain because it was young and moved fast before it hit the Appalachians, said University of Albany hurricane expert Kristen Corbosiero.

“It was not just a perfect storm, but it was a combination of multiple storms that that led to the enormous amount of rain,” Maue said. “That collected at high elevation, we’re talking 3,000 to 6000 feet. And when you drop trillions of gallons on a mountain, that has to go down.”

The fact that these storms hit the mountains made everything worse, and not just because of runoff. The interaction between the mountains and the storm systems wrings more moisture out of the air, Clark, Maue and Corbosiero said.

North Carolina weather officials said their top measurement total was 31.33 inches in the tiny town of Busick. Mount Mitchell also got more than 2 feet of rainfall.

Before 2017’s Hurricane Harvey, “I said to our colleagues, you know, I never thought in my career that we would measure rainfall in feet,” Clark said. “And after Harvey, Florence, the more isolated events in eastern Kentucky, portions of South Dakota. We’re seeing events year in and year out where we are measuring rainfall in feet.”

Storms are getting wetter as the climate change s, said Corbosiero and Dello. A basic law of physics says the air holds nearly 4% more moisture for every degree Fahrenheit warmer (7% for every degree Celsius) and the world has warmed more than 2 degrees (1.2 degrees Celsius) since pre-industrial times.

Corbosiero said meteorologists are vigorously debating how much of Helene is due to worsening climate change and how much is random.

For Dello, the “fingerprints of climate change” were clear.

“We’ve seen tropical storm impacts in western North Carolina. But these storms are wetter and these storms are warmer. And there would have been a time when a tropical storm would have been heading toward North Carolina and would have caused some rain and some damage, but not apocalyptic destruction. ”

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Follow AP’s climate coverage at https://apnews.com/hub/climate

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Follow Seth Borenstein on Twitter at @borenbears

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‘Big Sam’: Paleontologists unearth giant skull of Pachyrhinosaurus in Alberta

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It’s a dinosaur that roamed Alberta’s badlands more than 70 million years ago, sporting a big, bumpy, bony head the size of a baby elephant.

On Wednesday, paleontologists near Grande Prairie pulled its 272-kilogram skull from the ground.

They call it “Big Sam.”

The adult Pachyrhinosaurus is the second plant-eating dinosaur to be unearthed from a dense bonebed belonging to a herd that died together on the edge of a valley that now sits 450 kilometres northwest of Edmonton.

It didn’t die alone.

“We have hundreds of juvenile bones in the bonebed, so we know that there are many babies and some adults among all of the big adults,” Emily Bamforth, a paleontologist with the nearby Philip J. Currie Dinosaur Museum, said in an interview on the way to the dig site.

She described the horned Pachyrhinosaurus as “the smaller, older cousin of the triceratops.”

“This species of dinosaur is endemic to the Grand Prairie area, so it’s found here and nowhere else in the world. They are … kind of about the size of an Indian elephant and a rhino,” she added.

The head alone, she said, is about the size of a baby elephant.

The discovery was a long time coming.

The bonebed was first discovered by a high school teacher out for a walk about 50 years ago. It took the teacher a decade to get anyone from southern Alberta to come to take a look.

“At the time, sort of in the ’70s and ’80s, paleontology in northern Alberta was virtually unknown,” said Bamforth.

When paleontogists eventually got to the site, Bamforth said, they learned “it’s actually one of the densest dinosaur bonebeds in North America.”

“It contains about 100 to 300 bones per square metre,” she said.

Paleontologists have been at the site sporadically ever since, combing through bones belonging to turtles, dinosaurs and lizards. Sixteen years ago, they discovered a large skull of an approximately 30-year-old Pachyrhinosaurus, which is now at the museum.

About a year ago, they found the second adult: Big Sam.

Bamforth said both dinosaurs are believed to have been the elders in the herd.

“Their distinguishing feature is that, instead of having a horn on their nose like a triceratops, they had this big, bony bump called a boss. And they have big, bony bumps over their eyes as well,” she said.

“It makes them look a little strange. It’s the one dinosaur that if you find it, it’s the only possible thing it can be.”

The genders of the two adults are unknown.

Bamforth said the extraction was difficult because Big Sam was intertwined in a cluster of about 300 other bones.

The skull was found upside down, “as if the animal was lying on its back,” but was well preserved, she said.

She said the excavation process involved putting plaster on the skull and wooden planks around if for stability. From there, it was lifted out — very carefully — with a crane, and was to be shipped on a trolley to the museum for study.

“I have extracted skulls in the past. This is probably the biggest one I’ve ever done though,” said Bamforth.

“It’s pretty exciting.”

This report by The Canadian Press was first published Sept. 25, 2024.

The Canadian Press. All rights reserved.

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The ancient jar smashed by a 4-year-old is back on display at an Israeli museum after repair

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TEL AVIV, Israel (AP) — A rare Bronze-Era jar accidentally smashed by a 4-year-old visiting a museum was back on display Wednesday after restoration experts were able to carefully piece the artifact back together.

Last month, a family from northern Israel was visiting the museum when their youngest son tipped over the jar, which smashed into pieces.

Alex Geller, the boy’s father, said his son — the youngest of three — is exceptionally curious, and that the moment he heard the crash, “please let that not be my child” was the first thought that raced through his head.

The jar has been on display at the Hecht Museum in Haifa for 35 years. It was one of the only containers of its size and from that period still complete when it was discovered.

The Bronze Age jar is one of many artifacts exhibited out in the open, part of the Hecht Museum’s vision of letting visitors explore history without glass barriers, said Inbal Rivlin, the director of the museum, which is associated with Haifa University in northern Israel.

It was likely used to hold wine or oil, and dates back to between 2200 and 1500 B.C.

Rivlin and the museum decided to turn the moment, which captured international attention, into a teaching moment, inviting the Geller family back for a special visit and hands-on activity to illustrate the restoration process.

Rivlin added that the incident provided a welcome distraction from the ongoing war in Gaza. “Well, he’s just a kid. So I think that somehow it touches the heart of the people in Israel and around the world,“ said Rivlin.

Roee Shafir, a restoration expert at the museum, said the repairs would be fairly simple, as the pieces were from a single, complete jar. Archaeologists often face the more daunting task of sifting through piles of shards from multiple objects and trying to piece them together.

Experts used 3D technology, hi-resolution videos, and special glue to painstakingly reconstruct the large jar.

Less than two weeks after it broke, the jar went back on display at the museum. The gluing process left small hairline cracks, and a few pieces are missing, but the jar’s impressive size remains.

The only noticeable difference in the exhibit was a new sign reading “please don’t touch.”

The Canadian Press. All rights reserved.

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