Intact DNA from a 7,200-year-old Woman reveals Unknown Human lineage
Archaeologists have discovered ancient DNA in the remains of a woman who died 7,200 years ago in Indonesia, a find that challenges what was previously known about the migration of early humans.
The skeletal remains of the ancient Toalean woman were found nestled among large rocks in a burial pit in Indonesia’s Leang Panninge cave.
The remains, belonging to a teenager nicknamed Bessé, were discovered in the Leang Panninge cave on the Indonesian island of Sulawesi. Initial excavations were undertaken in 2015.
The discovery, published in the journal Nature, is believed to be the first time ancient human DNA has been discovered in Wallacea, the vast chain of islands and atolls in the ocean between mainland Asia and Australia.
The DNA was extracted from the petrous part of Bessé’s temporal bone, which houses the inner ear.
Griffith University’s Prof Adam Brumm, who co-led the research, said the intact DNA was a rare find.
“The humid tropics are very unforgiving on DNA preservation in ancient human bones and teeth,” Brumm said.
“There’s only one or two pre-neolithic skeletons that have yielded ancient DNA in all of mainland south-east Asia.
“Elsewhere in the world – in the northern latitudes of Europe, in America – ancient DNA analysis is completely revolutionising our understanding of the early human story: the genetic diversity of ancient humans, population movements, demographic history.”
Initial excavations started in 2015 at the Leang Panninge cave on the island of Sulawesi.
The researchers describe Bessé as a “genetic fossil”. Genetic sequencing showed she had a unique ancestral history not shared by anyone living today, nor any known humans from the ancient past, Brumm said.
Around half of Bessé’s genetic makeup is similar to present-day Indigenous Australians and people from New Guinea and the Western Pacific islands.
“Her ancestors would have been a part of the initial wave of movement of early humans from mainland Asia through these Wallacean islands towards what we today call Sahul, which was the combined ice age landmass of Australia and New Guinea,” Brumm said.
Toalean stone arrowheads. Bessé remains were found alongside prehistoric tools and red ochre.
Surprisingly, Bessé’s DNA also showed an ancient link to east Asia, which challenges what was previously known about the timeline of migration to Wallacea.
“It is thought that the first time people with predominantly Asian ancestry entered the Wallacean region was around about three or four thousand years ago when the first prehistoric neolithic farmers entered the region from Taiwan,” Brumm said.
“If we’re finding this Asian ancestry in a hunter-gatherer person who lived thousands of years before the arrival of these neolithic people from Taiwan, then it suggests … earlier movement of some population from Asia into this region.”
Bessé is also the first known skeleton belonging to the Toalean culture, a group of hunter-gatherers who lived in South Sulawesi between 1,500 and 8,000 years ago.
She was around 17 to 18 years old at the time of burial. Prehistoric stone tools and red ochre were found alongside her remains. Her grave also contained bones of hunted wild animals.
Spectacular Fossil of ‘Dueling Dinosaurs’ Can Finally Reveal Its Secrets
Palaeontologists will finally have the chance to study in detail an exquisite fossil containing what appears to be the most complete Tyrannosaurus and Triceratops skeletons on record, tangled together in possible epic combat.
Close-up to the juvenile T. rex specimen of ‘Dueling Dinosaurs
Originally discovered in 2006, the ‘Dueling Dinosaurs’ fossil was kept in private hands and locked away in warehouses for 15 years.
The prestigious find was finally acquired by the North Carolina Museum of Natural Sciences (NCMNS) and is promised to shed new light on the paleobiology of the most famous prehistoric adversaries ever existed.
An iconic battle?
Did the juvenile tyrannosaur and the full-grown ceratopsian actually fight each other to death? Or did the two animals entombed together by chance, perhaps as carcasses caught on the same river sandbar? No one knows for sure, but there’s a series of tantalizing clues that need to be taken into account.
For example, the juvenile Tyrannosaurus had most of its teeth broken, its skull is cracked and it also bears a broken finger. Triceratops for its part had tyrannosaur teeth embedded in their spine.
Whether the aforementioned injuries were sustained during a brutal battle between the two adversaries or occurred after each creature’s death is yet to be concluded.
Most scientists agree that the full excavation of the skeletons may help solve this 66 million-year-old mystery.
The ‘Dueling Dinosaurs’ fossil may represent a lethal struggle between a Triceratops and a juvenile T. rex.
A precious fossil
The ‘Dueling Dinosaurs’ fossil is a truly remarkable find. It is thought to include 100% of both creatures’ bones, as well as body outlines, skin impressions, and possibly even the remains of soft tissues and stomach contents.
“What is remarkable about these specimens is they still preserve all their context about the late Cretaceous period surroundings. So we can really dive in and know there is integrity in the scientific data that will come from these specimens,” said Lindsay Zanno, a palaeontologist at North Carolina State University and the NCMNS head of palaeontology.
Some of the questions researchers want to answer about the fossils include determining if molecules are preserved in the skin impressions and if the tyrannosaur fossil shows evidence of feathers.
Moreover, the juvenile tyrannosaur specimen could shed new light on the growing stages of the ‘tyrant lizard king’ and its transformation from an agile hunter to a bulky superpredator.
The ‘Dueling Dinosaurs’ compared to a human
Epilogue
Despite being a recurring theme across most dinosaur media, the iconic showdown between T.rex and Triceratops was only weakly backed up by scientific evidence.
The examination of the ‘Dueling Dinosaurs’ fossil could confirm -among others, that such violent interactions did indeed take place in the Late Cretaceous North America 66 million years ago…
The fossil will be housed in a new expansion to the North Carolina Museum of Natural Science, including a state-of-the-art palaeontology lab, that will open in 2022. For more information about this spectacular fossil as well as the future exhibit visit the official site of the NCMNS here.
Archaeologists identify oldest Muslim graves ever found in Europe
An archaeological site in northeast Spain holds one of the oldest-known Muslim cemeteries in the country, with the discovery of 433 graves, some dating back to the first 100 years of the Islamic conquest of the Iberian Peninsula.
Archaeologists think up to 4,500 bodies may have been buried in the ancient necropolis at Tauste over 400 years of Muslim rule.
The finds confirm that the region, along the frontier between the warring Islamic and Christian worlds in the turbulent early Middle Ages, was once dominated by Muslim rulers, who were later replaced by Christian rulers and their history forgotten.
The archaeologists unearthed the ancient graves from a maqbara or Muslim necropolis, dating from between the eighth and the 12th centuries, this summer in the town of Tauste, in the Ebro Valley about 25 miles (40 kilometres) northwest of Zaragoza.
The remains show that the dead were buried according to Muslim funeral rituals and suggest the town was largely Islamic for hundreds of years, despite there being no mention of this phase in local histories.
“The number of people buried in the necropolis and the time it was occupied indicates that Tauste was an important town in the Ebro Valley in Islamic times,” lead archaeologist Eva Giménez of the heritage company Paleoymás told Live Science.
Giménez and the company Paleoymás were contracted for the latest excavations by El Patiaz Cultural Association, which was founded by local people in 1999 to investigate the history of the town.
Their initial excavations in 2010 suggested that a 5-acre (2 hectares) Islamic necropolis at Tauste might hold the remains of up to 4,500 people. But the association’s limited funds meant only 46 graves could be unearthed in the first four years of work.
Giménez said the latest discoveries hint that even more Muslim graves could still be found. “We now have information that indicates that the size of the necropolis is greater than what was known,” she said.
Archaeologists think up to 4,500 bodies may have been buried in the ancient necropolis at Tauste over 400 years of Muslim rule.
The Islamic phase of Tauste’s history had been forgotten – perhaps deliberately – and ancient graves sometimes found in the town were dismissed as those of victims of the 19th-century cholera pandemic.
The latest excavations at Tauste focused on a single road known to pass through the ancient Islamic necropolis. The remains of 433 people were unearthed there who had been buried according to Muslim funeral rituals.
Muslim conquest
The graves date all the way back to the time when Muslim armies from North Africa that were allied with Islam’s Umayyad caliphate in Damascus invaded what is now Spain in A.D. 711. By 718, they had conquered most of the Iberian Peninsula — today’s Spain and Portugal — except for some mountainous regions of the northwest that remained independent Christian kingdoms.
The Muslim invaders, called “Moors” by the Christians, then attempted to conquer Gaul — now France — but were turned back, first at the Battle of Toulouse in 721 and then at the Battle of Tours in 732, where they were defeated by a smaller Frankish army led by the nobleman Charles Martel. It’s said the Frankish use of heavy cavalry played a decisive part in the battle, Live Science previously reported.
After that, Muslim leaders established their rule south of Barcelona and the Pyrenees, the mountain range that divides Spain and France. The Ebro Valley around Zaragoza, however, stayed in Muslim hands.
The Muslim-ruled region became known as al-Andalus — with the “Andal” part possibly from the name of the Vandals the Muslims had conquered — and reached its cultural peak in about the 10th century with advances in mathematics, astronomy and medicine. By some accounts, the regime was relatively benign. Jews and Christians were allowed to practice their religions if they chose not to convert to Islam, but they paid extra tax, called jizya, and were treated as a lower social class than Muslims.
Muslim rule in Spain began to fragment after the 11th century, and the Christian kingdoms in the north grew more powerful. The last Muslim emirate, at Granada, was defeated in 1492 by the armies of Castile in the final battle of the Christian Reconquista led by Isabela and Ferdinand, the first queen and king of Spain. Islam was outlawed, and violent anti-Muslim persecutions continued until the early 17th century.
The influence of Islamic rule has been recognized in nearby parts of the region, but history was silent about the Islamic phase at Tauste.
Ancient graves were sometimes unearthed in the town, but they were dismissed as those of victims of a cholera pandemic that killed almost a quarter-million people in Spain in 1854 and 1855, said Miriam Pina Pardos, the director of the Anthropological Observatory of the Islamic Necropolis of Tauste for El Patiaz.
Unearthing Islam
Some members of El Patiaz suspected an 11th-century church tower in the town had Islamic origins — a suspicion confirmed when examinations showed it was once a minaret in the distinctive Zagri architecture..
So in 2010, the group began excavations led by archaeologist Francisco Javier Gutierrez. They learned the ancient graves at Tauste contained individuals buried with Muslim rituals, and not in the style of a mass burial that might have been expected for victims of the cholera pandemic, Pina Pardos said.
For instance, each grave held the remains of a single person, typically placed lying on their right side so that their gaze was oriented toward Mecca, and each was covered with a mound of earth, Gutierrez said. Some may also have had a wooden cover, now missing.
The graves also showed other distinctive Muslim features: They were just large enough to accommodate the body, and the dead were buried in a white shroud, regardless of their social status, she said. To this day, Muslim rituals do not allow the dead to be buried with grave goods, but fragments of ceramics found nearby in the excavations since 2010 showed they dated to between the eighth and 12th centuries, Giménez said.
While the existence of the Islamic graveyard was known from the earlier excavations, “what was not known where the dimensions and density of the tombs,” she said. “It has been expected and unexpected at the same time.”
The latest discoveries, in a single street known to be part of the ancient necropolis, show the extent of Muslim influence in the town over several centuries.,
The cemetery was in use continuously for more than 400 years, they found. “This tells us about a constant and deeply rooted [Islamic] population in Tauste since the beginning of the eighth century,” Giménez said.
Hittite Prince’s Seal and Cuneiform Tablet Uncovered in Turkey
A 3,250-year-old seal belonging to a Hittite prince and an ancient cuneiform tablet dating back 3,400 years were discovered in Turkey’s southern Hatay province.
The excavations in Accana Hoyuk of the Reyhanli district in Hatay on behalf of the Culture and Tourism Ministry with the support of the Turkish Historical Society, have been underway for six months.
Speaking to Anadolu Agency, Murat Akar, the head of the excavation team and Mustafa Kemal University’s Protohistory and Near East Archeology Department chair, said they have had some “thrilling” findings.
An ancient tablet they have unearthed has Akkadian cuneiform texts, Akar noted, saying: “The tablet, around 3,400 years old, and the accompanying cylinder seals give us information about the administration and administrative practices of the region, especially during a period when the region was under the rule of the Mitanni Empire.”
He said they had found a 3,250-year-old seal during the latest excavation, adding that the item is one of the most important discoveries of this year, helping us understand “what happened during the period after the region came under the Hittite control” as well as “define its administrative and political dynamics.”
Akar further noted that the findings provide information about the administrative and archival practices in the Alalakh ancient city, the capital of the Mukish Kingdom in the Middle and Late Bronze Age.
“The written documents we found are extremely exciting,” he said.
The impressions on the cylinder seals show the existence of a ruling class in the region, Akar said, adding: “This last one, with Luwian hieroglyphic inscription on it, gives us the name of a Hittite prince whose name is not included in other written documents in Alalakh and appears for the first time.”
He did not reveal the name of the Hittite prince but said a Hittitology academic at Istanbul University Faculty of Letters, Hasan Peker, will share the name of the prince with the scientific community once the research is completed.
Four Of North America’s Oldest Human Skulls Don’t Look Much Alike
The earliest humans in North America were far more diverse than previously realized, according to a new study of human remains found within one of the world’s most extensive underwater cave systems.
The original position of the skeletal remains inside the submerged cave of Muknal. These remains date back to about 10,000 years ago and belonged to an adult male.
The remains, discovered in the caverns of the Mexican state of Quintana Roo, represent just four of the earliest North Americans, all of whom lived between 9,000 and 13,000 years ago. They’re important because North American remains from the first millennia of human habitation in the Americas are rare, said study leader Mark Hubbe, an anthropologist at The Ohio State University. Fewer than two dozen individuals have been discovered, he added.
What makes the four individuals from Mexico interesting is that none of them is quite alike. One resembles peoples from the Arctic, another has European features and one looks much like early South American skulls, while the last doesn’t share features with anyone population.
“The differences we see among these Mexican skulls are on the same magnitude as the most different populations nowadays,” Hubbe told Live Science.
The settlement of the Americas is a complicated topic, shrouded in mystery because of the dearth of archaeological findings from 15,000 to 20,000 years ago, which is probably when the first humans set foot on the continent. South America has more early human remains than North America, Hubbe said. The skulls found in South America are typically quite similar to one another, sharing features of skull measurements with indigenous Australians and Africans.
This doesn’t mean that the South Americans had ancestors who came directly from Australia or Africa, Hubbe cautions. Rather, the shared features reveal a shared common ancestry between ancient South Americans and the peoples of Australia and Africa.
“The [skull] morphologies in Asia changed a lot in the last 10,000 years,” Hubbe said. “Everyone who came [to the Americas] before 10,000 years ago would look a lot like early modern humans out of Africa and Australia.”
Because the path to South America must have included pit stops in North America or along the Pacific coast, the assumption has long been that early people in South America looked a lot like early people in North America. But the new research suggests otherwise, Hubbe said. Instead, early North American populations look far more diverse than early South American populations.
“For whatever reason, when they went to South America, part of this diversity disappeared,” Hubbe said.
The extensive caves of Quintana Roo are now mostly underwater. But about 12,000 years ago, during the end of the Pleistocene epoch and the beginning of the Holocene, sea levels were lower and the caves were dry. Some of the early inhabitants of Mexico seemed to use the caves as burial places, deliberately placing bodies inside. Some other skeletons discovered in the caves appear to indicate that those people’s deaths may have been accidental.
Of the four skulls studied in the new research, published today in the journal PLOS ONE, one came from a young adult woman who lived around 13,000 years ago; one belonged to a young adult male from the same era; one was from a middle-aged woman who lived between about 9,000 and 12,000 years ago, and the fourth was that of a middle-aged man from around 10,000 years ago. Hubbe and his co-authors used computed tomography (CT) scanning to re-create digital, 3D images of the skulls. They then marked various landmarks on the skulls, such as the bottom of the nose or top of the eye orbits. Sizes and distances between landmarks were then used to compare the skulls to larger data sets of measurements from different populations of people around the world.
The four skulls, from cenotes (sinkholes) in the Mexican state of Quintana Roo, analyzed in the study.
There are limitations to working with the data of only four people, Hubbe said – after all, any given individual can be an outlier compared with the rest of his or her community. But, in an attempt to downplay any individual quirks of the skulls, the researchers focused only on the components of the measurements that explained the majority of the variations between skulls. By limiting the analysis to only major variations, they could avoid putting too much weight on smaller differences between skulls.
They found that the 13,000-year-old young woman had features that most closely matched Arctic North Americans from Greenland and Alaska. The young man from 13,000 years ago, on the other hand, looked most similar to people from European populations. The middle-aged female from between 9,000 and 12,000 years ago looked much like the earliest settlers of South America. Finally, the middle-aged man from around 10,000 years ago showed no clear pattern. He had features seen in several American and Asian populations.
The findings are important because they provide new information on the earliest Americans, said Richard Jantz, an anthropologist at the University of Tennessee who was not involved in the research. The skulls are diverse, he said, though he noted that all but the young man from 13,000 years ago had Asian or Native American affinities, so the differences shouldn’t be overexaggerated.
The new information complicates the fuzzy picture of who the first Americans were and how the earliest migrations worked.
North America could have been more diverse than South America if there were a consistent flow of people – and new genes – into North America, but only one or two big movements of populations through the funnel of Mexico into South America, Hubbe said.
“We cannot test this at this point,” he said.
That story also contradicts the genomic data researchers have collected. Genomics suggests that all Native Americans (with the exception of a few later migrants) descend from a single migration of people from Asia. But research-based on phenotype – the way people looked – suggests multiple migration events, creating a population that got regular injections of diversity.
“I think if America consisted of a homogenous population 10,000 or 15,000 years ago, that drawing skulls at random from it would not produce as much variation as you see,” Jantz said.
In today’s humans, Jantz said, genomics data and skull shape data generally mesh well — people with similar ancestry tend to show similarities in their skull measurements. So far, the same does not seem to be the case for the earliest Americans. But there are limitations in data on both the genetic and the archaeological sites, Jantz said. Genomics researchers have only three ancient DNA samples from North America, and modern Native Americans’ genetic profiles have been complicated by genocide and mixture with Europeans. Researchers who study skull morphology have only a handful of bones to work with, as well.
“To me,” Jantz said, “the biggest challenge is reconciling conflicting lines of evidence.”
Long-Hidden “Pyramid” Found in Indonesia Was Likely an Ancient Temple
When Dutch colonists became the first Europeans to discover Gunung (Mount) Padang in the early 20th century, they must have been awestruck by the sheer scale of their ancient stone surroundings.
Here, scattered across a vast hilltop in the West Java province of Indonesia, lay the remnants of a massive complex of rocky structures and monuments – an archaeological wonder since described as the largest megalithic site in all of Southeastern Asia.
But those early settlers couldn’t have guessed the greatest wonder of all might lay hidden, buried deep in the ground below their feet.
In controversial new research presented at the AGU 2018 Fall Meeting in Washington, DC, last week, a team of Indonesian scientists presented data to make their case that Gunung Padang is in fact the site of the world’s oldest known pyramid-like structure.
Their research, which has been conducted over the course of several years, suggests that Gunung Padang is not the hill we think it is – but is actually a layered series of ancient structures with foundations dating back some 10,000 years (or even older).
“Our studies prove that the structure does not cover just the top but also wrap around the slopes covering about 15 hectares area at least,” the authors write in the abstract for their new poster.
“The structures are not only superficial but rooted into greater depth.”
Using a combination of surveying methods – including ground penetration radar (GPR), seismic tomography, and archaeological excavations – the team says Gunung Padang is not just an artificial structure, but a series of several layers built over consecutive prehistoric periods.
The topmost, megalithic layer made up of rock columns, walls, paths, and spaces sit above a second layer some 1-3 metres below the surface.
The researchers suggest this second layer has previously been misinterpreted as natural rock formation but is actually another arrangement of columnar rocks organised in a matrix structure.
Below this, the third layer of arranged rocks – containing large underground cavities or chambers – extends as far as 15 metres deep, and this sits upon the lowest (fourth) layer, made of ‘lava tongue’ basalt rock, somehow modified or carved by human hands.
According to the researchers, preliminary radiocarbon dating suggests the first layer could be up to approximately 3,500 old years old, the second layer somewhere around 8,000 years old, and the third layer in the vicinity of 9,500 to 28,000 years old.
As for the purpose of these ancient, vast structures, the researchers – led by geophysicist Danny Hilman Natawidjaja from the Indonesian Institute of Sciences – suggest the ancient pyramid could have had a religious basis.
“It’s a unique temple,” Natawidjaja told Live Science.
For now, that’s speculation, but if the researchers’ other claims about the structures turn out to be right, it’s a major finding that could challenge notions of what prehistoric societies were capable of.
‘It’s huge,” Natawidjaja told The Sydney Morning Herald in 2013. ”People think the prehistoric age was primitive, but this monument proves that wrong.”
Still, not everybody is convinced. Natawidjaja’s research has been the subject of much controversy in Indonesia and elsewhere, with a large number of archaeologists and sceptics criticising the team’s methods and findings.
The latest research presentations – which, for now, remain non-peer-reviewed – will probably add fuel to the fire, but they also give the world a closer glimpse at what could be one of the world’s most ancient and mysterious structures.
As for what that structure really is, only time will tell.
8,000 years of history to resurface at Turkey’s Tavşanlı Mound
Excavations set to start at a mound in the central Turkish province of Kütahya in September are expected to shed light on 8,000 years of history, archaeologists said.
An aerial view of the Tavşanlı Mound, Kütahya, central Turkey.
Dubbed the “Heart of Kütahya” over its shape detected through aerial footage, the “Tavşanlı Mound” located in the namesake district will be unearthed through the cooperation of the Ministry of Culture and Tourism and Bilecik Şeyh Edebali University (BŞEU), along with the support of the Tavşanlı Municipality.
Academics from Ankara University, Ankara Hacı Bayram Veli University, Hacettepe University, Istanbul University, Zonguldak Bülent Ecevit University and Uşak University will also take part in the excavations, to be headed by Erkan Fidan, a faculty member at the archaeology department of the BŞEU.
An aerial view from the Tavşanlı Mound, Kütahya, central Turkey.
The excavations were launched through a presidential decree and are expected to last some 30 years.
Sezer Seçer Fidan, a Hittitologist who is also in charge of the Tavşanlı Mound site, told Anadolu Agency (AA) that the mound was once one of the largest settlements in western Anatolia.
“While previous settlements here were a conglomeration of a couple of villages, as the swamps were filled and drained, it becomes a site that could serve as the basis for urbanization and turn into a capital city.
This corresponds roughly to (a period) four to 5,000 years earlier. Urbanization at this site of course does not consist of a single-phase, but a formation that continues to expand over time,” Fidan said.
Archaeologists work on the Tavşanlı Mound, Kütahya, central Turkey.
She explained that the goal for excavations during this year is to uncover city walls dating back to the Hittites and modern ages, which would prove the importance and scale of the Tavşanlı Mound.
Fidan noted that the mound might contain information, documents and findings on those who have lived in western Anatolia for the last 8,000 years.
“The settlement here lasted until the end of the Bronze Age; therefore, we can see a number of ages stratigraphically. Here, we both want to monitor transitions between civilizations and the exact importance of such a large mound spanning a hectare (in size). … If we can detect buildings related to the Hittite period, then we can find written documents or findings.
It would be a very important finding for western Anatolia since written documents are very rare in this region,” she noted.
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.
This fossilized horseshoe crab (Euproops danae), shown in the left image, held a perfectly preserved mold of its brain, shown close-up in panel B. Panel C shows a reconstruction of Euproops danae, including the position and anatomy of the brain.
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.
