How fossilization preserved a 310-million-year-old horseshoe crab’s brain

Researchers have uncovered a never-before-seen fossilized brain from a 310 million-year-old horseshoe crab, revealing some surprises about the evolution of these wannabe crustaceans, according to a new study.

The fossilized brain, which belongs to the extinct species Euproops Danae, was discovered at Mazon Creek in Illinois, where the conditions were just right to perfectly preserve the animal’s delicate soft tissue. 

There are four species of horseshoe crabs alive today — all of which sport hard exoskeletons, 10 legs and a U-shaped head. Despite their name, these “crabs” are actually arachnids that are closely related to scorpions and spiders, according to The National Wildlife Federation.

Although horseshoe crab fossils are relatively common, nothing was previously known about their ancient brains, the researchers said. 

“This is the first and only evidence for a brain in a fossil horseshoe crab,” lead author Russell Bicknell, a palaeontologist at the University of New England in Maine, told Live Science. The chances of finding a fossilized brain are “one in a million,” he added. “Although, even then, chances are they are even rarer.” 

Soft tissues that makeup brains are very prone to rapid decay, Bicknell said. “In order for them to be preserved, either very special geological conditions, or amber, are needed.”

In this case, geology helped to keep the soft tissue in tip-top condition over the years and preserve the brain — or at least a copy of the brain. “We have a mould of the brain, not the brain itself, so to speak,” Bicknell said. 

The deposits at Mazon Creek are made of an iron carbonate mineral called siderite, which forms concretions — mineral precipitations — that can quickly encase a dead body and fossilize it.

Although such concretions preserved the horseshoe crab’s body, the brain tissue still decomposed and eventually disappeared. However, as the brain rotted away it was replaced by a clay mineral called kaolinite, which created a cast of the brain.

Kaolite is white in colour, whereas siderite is dark grey. This colour contrast meant the brain fossil “stood out more than it would have normally” from the rest of the fossil, Bicknell said.

The hunt is now on for more ancient brains that might have been fossilized in the unique geological conditions that preserved this horseshoe crab.

“The Mazon Creek deposit is exceptional,” Bicknell said. “If we started looking, we may be lucky enough to find more [brain fossils].”

The discovery provided researchers with the unique opportunity to study how the arachnids’ brains evolved over time. But to the researchers’ surprise, they found that the ancient brain, which dates to the Carboniferous period (359 million to 299 million years ago), was remarkably similar to that of a modern horseshoe crab.

“Despite 300 million years of evolution, the fossil horseshoe crab brain is pretty much the same as modern forms,” Bicknell said.

The 70 Million-Year-Old History of the Mississippi River

In 1758, the French ethnographer Antoine-Simon Le Page du Pratz published The History of Louisiana, in which he wrote that the Mississippi River’s name meant “the ancient father of rivers.” Though his etymology was off—the Ojibwe words that gave us Mississippi (Misi-ziibi) actually mean “long river”—the idea has proven durable. “Ol’ Man River” buoyed Show Boat, the 1927 musical by Jerome Kern and Oscar Hammerstein II.

During the 1937 flood, Raymond Daniell wrote in the New York Times about frantic efforts to raise barriers “faster than old man river could rise.”

Now it appears that the Mississippi is far older than Le Page thought, and it used to be far bigger than the Ojibwe could have imagined. And it might even become that big again in the future.

These are the extraordinary new findings unearthed by geologists including Sally Potter-McIntyre at Southern Illinois University, Michael Blum at the University of Kansas and Randel Cox at the University of Memphis, whose work is helping us better understand the monumental events, beginning in late Cretaceous North America, that gave rise to the Mississippi, swelling it to gargantuan proportions.

In the late Cretaceous, around 80 million years ago, a mountain chain spanned the southern portion of the continent, blocking southbound water flows, so most North American rivers flowed to the Western Interior Sea or north to Canada’s Hudson Bay.

Eventually, a gap in those mountains formed, opening a path for the river we now know as the Mississippi to flow to the Gulf of Mexico. Scientists call that gap the Mississippi Embayment, but the rest of us know it as the Mississippi Delta, the vast flood plain that stretches from southern Missouri to northern Louisiana.

As recently as 2014, geological consensus held that the Mississippi began flowing through the embayment around 20 million years ago. But in 2018, Potter-McIntyre and her team concluded, based on the age of zircon fragments they excavated from sandstone in southern Illinois, that the river began flowing much earlier—some 70 million years ago.

The Mississippi was thus born when dinosaurs still roamed the planet; one can almost picture an alamosaurus bending its prodigious neck to drink from its waters. By contrast, the Missouri River, in its current form, dates back a mere two million years. Old Man River, indeed.

Still, 70 million years ago the Mississippi was nowhere near as large as it would become. Blum has detailed how the waterway grew as it added tributaries: the Platte, Arkansas and Tennessee rivers by the late Paleocene, then the Red River by the Oligocene.

Around 60 million years ago, the Mississippi was collecting water from the Rockies to the Appalachians; by four million years ago, its watershed had extended into Canada, and the Mississippi had grown to an enormous size, carrying four to eight times as much water as it does today, Cox and colleagues have found. “This was a giant river, on the order of the Amazon,” said Cox.

So the river’s larger-than-life role in culture was perhaps inevitable. Until the early 19th century, the Mississippi marked the western border between Spanish and American territory, and it continues to give life to the cities that sprang up along its route.

After Union forces captured Vicksburg, Mississippi, in 1863, President Abraham Lincoln saw the emancipated river as a symbol of a nation unified: “The Father of Waters again goes unvexed to the sea,” he wrote.

Mark Twain, the best publicist a river ever had, inspired 150 years’ worth of dreams about floating away from our troubles. And among members of the Ojibwe, Dakota and Chitimacha tribes, who still live on portions of ancestral lands in the Mississippi Valley, a spiritual connection to the river remains strong.

In 2013, Nibi Walk, a group of Indigenous women walked 1,500 miles along the Mississippi to advocate for clean water—an issue of vital importance to the 18 million Americans who get their drinking water from the river.

The river’s famed fluctuations have shaped American urbanization, too. The Great Flood of 1927 accelerated the Great Migration, as African Americans, disproportionately displaced, sought economic opportunity in cities such as Chicago and Detroit.

“Old Mississippi River, what a fix you left me in,” Bessie Smith sings in “Homeless Blues,” one of many songs about the 1927 flood. That disaster also ushered in an era of unprecedented public works, as the federal government sought to remake the river into a predictable route for moving bulk necessities like corn and coal.

The mighty river has inspired more than a thousand songs since 1900, including “Big River” by Johnny Cash and “Proud Mary,” in which John Fogerty (echoed later by Tina Turner) observes that “people on the river are happy to give.” That truism is confirmed every year when people who live along the Mississippi offer a meal and a shower to the dozens of strangers who test themselves against Old Man River by paddling small boats from Minnesota to the Gulf of Mexico.

This Gorgeous Ice Cavern Has An Ancient Forest Underneath

Mendenhall Glacier is one of the most picturesque places that is situated in Southeast Alaska. It is whoppingly 13.6 miles long. There is a number of ice caves that can be located in this Glacier. Also, an ancient forest was revealed beneath the glacier in the last decade due to rapidly melting ice.

Basically, a glacier is a very large amount of snow piled up together and then turned into ice. Sadly, global warming is causing glaciers around the globe to melt at a speed that has never been seen before, and Mendenhall Glacier is a victim too.

Mendenhall Glacier has shrunk 1.75 miles since 1929 and will continue to do so unless there is a proper solution implemented for global warming.

As the glacier is continuously retreating, remains of an ancient forest have been revealed underneath the glacier.

Well, preserved stumps and trunks can be now seen clearly after more than 2000 years.

Some of those trees still have their roots intact to the ground. The preservation is that good! Some of those still have the bark with them. It is quite possible to determine the age of those trees because most of them are in a growth position.

The research team that worked on these trees are calling them spruce or hemlock based on their diameter of the trunk and the trees growing in the region present day.

The Earth has passed different ice ages since its beginning. In those ice ages, glaciers have grown, advanced, and also shrunken and retreated. During those different periods, they send out liquefied ice streams that push aprons of gravel beyond the edge of glaciers. 

A similar thing happened with this uncovered ancient forest; it was sealed in what can be called the Tomb of Gravel.

This melting of ice is something that we should be highly concerned about. But at the same time, we can also spend our time learning about the climate of the old ages thanks to these kinds of events.

Denver museum to return looted relics to Cambodia after the U.S. moves to seize them

Decades after they were hacked from temples and other historical sites, four ancient statues from the Denver Museum of Art are finally heading home.

The museum has agreed to turn over the relics to the U.S. government, which plans to return them to their native Cambodia, according to a forfeiture complaint filed Monday in the Southern District of New York’s federal court.

The items include a likeness of the goddess of transcendent wisdom called the Prajnaparamita and another of the sun god Surya

The repatriation announcement comes amid mounting pressure by U.S. and Cambodian authorities on prominent art institutions to reexamine their collections of Khmer art, especially pieces acquired over decades of unrest in the country when looters stole vast numbers of culturally significant antiquities.

And it closely follows an investigation by the International Consortium of Investigative Journalists and The Washington Post, which reported last month that 10 museums—among them the Denver Art Museum—hold 43 relics in their collections linked to a notorious indicted art dealer, Douglas Latchford.

“I am delighted by the upcoming return of these four highly significant cultural objects to Cambodia,” said Phoeurng Sackona, the Cambodian Minister of Culture and Fine Arts. “Each one has a fascinating story and priceless value to our nation.”

In recent years, the Cambodian government has launched a vigorous effort to gather information on hundreds of valuable cultural artefacts the country says were stolen.

Many of these pieces now reside in the U.S., Western Europe and Australia.

Federal authorities said that the four pieces in Denver were identified as stolen by the former leader of a major Cambodian looting team that removed ancient artefacts when the country was governed by the genocidal Khmer Rouge regime in the 1970s.

The museum acquired the relics from Latchford between 2000 and 2005, according to the forfeiture filing.

Latchford was indicted in 2019 for allegedly looting Cambodia’s cultural heritage on a grand scale. The case against Latchford was dropped last year after he died.

Over his decades of trading antiquities, Latchford amassed one of the world’s largest private collections of Khmer treasures, mostly Hindu and Buddhist sculptures.

Why this 300 million-year-old fossil discovered in Utah has the palaeontology world buzzing

A 300-million-year-old fossil discovered deep in Canyonlands National Park in Utah could belong to an entirely new species, reports Amy Joi O’Donoghue for the Deseret News.

The fossilized critter is an amniote—a land-dwelling vertebrate that lays eggs— and has four legs. It’s most likely an ancient ancestor of reptiles or mammals, though more testing is needed before scientists can definitively label it as a new species, reports Sherry Liang for CNN.

“It’s roughly the size of an iguana and (the fossil) preserves at least the vertebrae, top of the skull, and some of the shoulder girdle and forelimb,” Adam Marsh, the lead palaeontologist at Petrified Forest National Park, tells Mark Price for the Sacramento Bee.

Around a year ago, a Canyonlands park ranger stumbled across the fossil and reported it to the park. Then, scientists from the Natural History Museum of Utah, Petrified Forest National Park and the University of Southern California teamed up to dig into this discovery.

They filed for a research permit and excavated the fossil last month, reports CNN.

“This is cool because it’s 50 million years older than the oldest dinosaur fossil,” Marsh tells the Deseret. “So it’s kind of cool that it’s from a period in Earth’s history where we just don’t have a lot of fossils from in North America especially.”

This creature existed between the Pennsylvanian Period (323.2 to 298.9 million years ago) and the Permian (298.9 to 251.9 million years ago).

During the Pennsylvanian era, plants started to colonize dry land by way of more evolved seeds; animals did so through the evolution of the amniotic egg, in which the embryo develops inside a shell, like with birds and reptiles.

In the Permian, the planet’s continents started to squish together to form the supercontinent Pangea, and the era ended with the largest mass extinction in Earth’s history.

READ ALSO: HUMANS MAY HAVE SMOKED TOBACCO 12,300 YEARS AGO, SCIENTISTS FIND NEW EVIDENCE IN UTAH

“It’s a phenomenal specimen. You do not see something like that very often, so it’s really significant for that in itself,” Marsh tells CNN. “But what it indicates is that there’s probably more fossils out there, especially at Canyonlands, in this really important time interval.”

Adding to the excitement, Adam Huttenlocker, a biologist at the University of Southern California, tells CNN that finding fossils of aquatic creatures is common at Canyonlands, but this is the first time he’s heard of the discovery of a land-dwelling vertebrate in the park.

“It really goes to show what kind of fossil resources are hidden in our national parks waiting to be discovered and shared with the public,” Marsh tells the Sacramento Bee.

Vikings were in North America in 1021, researchers say

Vikings from Greenland — the first Europeans to arrive in the Americas — lived in a village in Canada’s Newfoundland exactly 1,000 years ago, according to research published Wednesday.

Scientists have known for many years that Vikings — a name given to the Norse by the English they raided — built a village at L’Anse aux Meadows in Newfoundland around the turn of the millennium. But a study published in Nature is the first to pinpoint the date of the Norse occupation.

The explorers — up to 100 people, both women and men — felled trees to build the village and to repair their ships, and the new study fixes a date they were thereby showing they cut down at least three trees in the year 1021 — at least 470 years before Christopher Columbus reached the Bahamas in 1492.

“This is the first time the date has been scientifically established,” said archaeologist Margot Kuitems, a researcher at the University of Groningen in the Netherlands and the study’s lead author.

“Previously the date was based only on sagas — oral histories that were only written down in the 13th century, at least 200 years after the events they described took place,” she said.

The first Norse settlers in Greenland were from Iceland and Scandinavia, and the arrival of the explorers in Newfoundland marks the first time that humanity circled the entire globe.

But their stay didn’t last long. The research suggests the Norse lived at L’Anse aux Meadows for three to 13 years before they abandoned the village and returned to Greenland.

The archaeological remains are now protected as a historic landmark and Parks Canada has built an interpretive centre nearby. It’s listed as a World Heritage Site by UNESCO.

The scientific key to the exact date that the Norse were there is a spike in a naturally radioactive form of carbon detected in ancient pieces of wood from the site: some cast-off sticks, part of a tree trunk and what looks to be a piece of a plank. Indigenous people occupied L’Anse aux Meadows both before and after the Norse, so the researchers made sure each piece had distinctive marks showing it was cut with metal tools — something the indigenous people did not have.

Archaeologists have long relied on radiocarbon dating to find an approximate date for organic materials such as wood, bones and charcoal, but the latest study uses a technique based on a global “cosmic ray event” — probably caused by massive solar flares — to determine an exact date.

Previous studies have established there was such a cosmic ray event in the year 993 that for a few months caused greater than usual levels of radioactive carbon-14 in the carbon dioxide of the atmosphere.

Trees “breathe” carbon dioxide as they grow, and so the researchers used that radioactive carbon signature to determine which of the annual growth rings seen in cross-sections of the wood was from 993, Kuitems said.

They then used a microscope to count the later growth rings until the bark of the wood, which gave them the exact year the tree had stopped growing — in other words, when it had been felled by the Norse.

To their surprise, each of the three pieces of wood they tested was from a tree cut down in 1021, although they were from three different trees — two firs and probably one juniper.

The researchers can’t tell if the date of 1021 was near the beginning of the end of the Norse occupation, but they expect further research on other wood from the site will expand the range of dates, Kuitems said.

The Norse voyages to Newfoundland are mentioned in two Icelandic sagas, which indicate L’Anse aux Meadows was a temporary home for explorers who arrived in up to six expeditions.

The first was led by Leif Erikson, known as Leif the Lucky — a son of Erik the Red, the founder of the first Norse settlement in Greenland.

L’Anse aux Meadows, too, was expected to be a permanent settlement, but the sagas indicate it was abandoned due to infighting and conflicts with indigenous people, whom the Norse called skræling — a word that probably means “wearers of animal skins.”

The sagas refer to the entire region as Vinland, which means “Wineland” — supposedly because it was warm enough for grapes used for wine to grow.

Since Newfoundland itself was then too cold for grapes, the name suggests the Norse also explored warmer regions further south, and pieces of exotic wood found at the site also indicate that Kuitems said.

The use of an ancient cosmic ray event to exactly date pieces of wood is a relatively new development, and similar techniques are being used to establish firm dates at other sites, said Sturt Manning, a professor of archaeology at Cornell University, who was not involved in the new study.

“It’s a clever application,” he said. “This is the first clear evidence of Europeans arriving in North America.”

Newly identified American sabre-toothed cat species was larger than a tiger and hunted rhinos

Scientists have identified a huge new saber-toothed cat species, Machairodus lahayishupup, that would have prowled the vast areas of North America between 5 and 9 million years ago, using detailed fossil comparison techniques.

One of the biggest cats ever discovered, M. lahayishupup is estimated in this new study to have a body mass of some 274 kilograms (604 pounds) or so, and possibly even bigger. It’s an ancient relative of the well-known Smilodon, the so-called saber-toothed tiger.

A total of seven M. lahayishupup fossil specimens, including upper arms and teeth, were analyzed and compared with other species to identify the new felid, with the fossils collected from museum collections in Oregon, Idaho, Texas, and California.

“One of the big stories of all of this is that we ended up uncovering specimen after specimen of this giant cat in museums in western North America,” says paleobiologist John Orcutt from Gonzaga University. “They were clearly big cats.”

“What we didn’t have then, that we have now, is the test of whether the size and anatomy of those bones tell us anything – and it turns out that yes, they do.”

The age and size of the fossils gave the researchers a good starting point. Then they used digital images and specialized software to find similarities between the relics – and differences from other cat species, which was just as important.

Points of reference on the specimens showed that they were from the same giant cat and that this cat was a species that hadn’t been identified before. Additional evidence came from the teeth, although the researchers admit that the details of how early saber-toothed cats were related to each other is a little “fuzzy”. 

Upper arms are crucial in these cats for killing prey, and the largest upper arm or humerus fossil discovered in the study was about 1.4 times the size of the same bone in a modern-day lion. That gives you an idea of just how hefty and powerful M. lahayishupup would have been.

“We believe these were animals that were routinely taking down bison-sized animals,” says paleontologist Jonathan Calede from Ohio State University. “This was by far the largest cat alive at that time.”

Rhinoceroses would have been abundant at the same and may have been animals that M. lahayishupup preyed on, alongside camels and sloths significantly bigger than the ones we’re used to today.

While the discoveries made of this new species so far don’t include the iconic saber teeth themselves, it’s significant that M. lahayishupup has been identified mostly from humerus bones, showing what’s possible with the latest analysis software added to many hours of careful study.

Peering back so many millions of years into the past isn’t easy, and the researchers say that a more detailed saber-tooth cat family tree is going to be needed to work out exactly where this species fits in. The findings also open up some interesting evolutionary questions about these giant cats.

“It’s been known that there were giant cats in Europe, Asia, and Africa, and now we have our own giant saber-toothed cat in North America during this period as well,” says Calede.

“There’s a very interesting pattern of either repeated independent evolution on every continent of this giant body size in what remains a pretty hyper-specialized way of hunting, or we have this ancestral giant saber-toothed cat that dispersed to all of those continents. It’s an interesting paleontological question.”