The analyses show that she was born and raised outside Denmark’s current borders, and strontium isotope analyses of the girl’s hair and a thumb nail also show that she travelled great distances the last two years of her life.
The wool from the Egtved Girl’s clothing, the blanket she was covered with, and the oxhide she was laid to rest on in the oak coffin all originate from a location outside present-day Denmark. The combination of the different provenance analyses indicates that the Egtved Girl, her clothing, and the oxhide come from Schwarzwald (“the Black Forest”) in South West Germany – as do the cremated remains of a six-year-old child who was buried with the Egtved Girl. The girl’s coffin dates the burial to a summer day in the year 1370 BC.
It is senior researcher Karin Margarita Frei, from the National Museum of Denmark and Centre for Textile Research at the University of Copenhagen, who has analysed the Egtved Girl’s strontium isotope signatures. The analyses have been carried out in collaboration with Kristian Kristiansen from the University of Gothenburg and the Department of Geosciences and Natural Resource Management and the Centre for GeoGenetics, both University of Copenhagen.
The research has been possible through the support of The Danish National Research Foundation, European Research Council, the Carlsberg Foundation and L’Oréal Denmark-UNESCO For Women in Science Award.
The results have just been published in Scientific Reports.
The girl’s movements mapped month by month
Strontium is an element which exists in the earth’s crust, but its prevalence is subject to geological variation. Humans, animals, and plants absorb strontium through water and food. By measuring the strontium isotopic signatures in archaeological remains, researchers can determine where humans and animals lived, and where plants grew because of their strontium isotope signatures. In that sense, strontium serves as a kind of GPS for scientists.
“I have analysed the strontium isotopic signatures of the enamel from one of the Egtved Girl’s first molars, which was fully formed/crystallized when she was three or four years old, and the analysis tells us that she was born and lived her first years in a region that is geologically older than and different from the peninsula of Jutland in Denmark,” Karin Margarita Frei says.
Karin Margarita Frei has also traced the last two years of the Egtved Girl’s life by examining the strontium isotopic signatures in the girl’s 23-centimetre-long hair. The analysis shows that she had been on a long journey shortly before she died, and this is the first time that researchers have been able to so accurately track a prehistoric person’s movements.
“If we consider the last two years of the girl’s life, we can see that, 13 to 15 months before her death, she stayed in a place with a strontium isotope signature very similar to the one that characterizes the area where she was born. Then she moved to an area that may well have been Jutland. After a period of c. 9 to 10 months there, she went back to the region she originally came from and stayed there for four to six months before she travelled to her final resting place, Egtved. Neither her hair nor her thumb nail contains a strontium isotopic signatures which indicates that she returned to Scandinavia until very shortly before she died. As an area’s strontium isotopic signature is only detectable in human hair and nails after a month, she must have come to “Denmark” and “Egtved” about a month before she passed away,” Karin Margarita Frei explains.
The Black Forest Girl
If the Egtved Girl was not born in Jutland, then where did she come from? Karin Margarita Frei suggests that she came from South West Germany, more specifically the Black Forest, which is located 500 miles south of Egtved.
Considered in isolation, the Egtved Girl’s strontium isotope signature could indicate that she came from Sweden, Norway or Western or Southern Europe. She could also come from the island Bornholm in the Baltic Sea. But when Karin Margarita Frei combines the girl’s strontium isotopic signatures with that of her clothing, she can pinpoint the girl’s place of origin relatively accurately.
“The wool that her clothing was made from did not come from Denmark and the strontium isotope values vary greatly from wool thread to wool thread. This proves that the wool was made from sheep that either grazed in different geographical areas or that they grazed in one vast area with very complex geology, and Black Forest’s bedrock is characterized by a similarly heterogeneous strontium isotopic range,” Karin Margarita Frei says.
That the Egtved Girl in all probability came from the Black Forest region in Germany comes as no surprise to professor Kristian Kristiansen from the University of Gothenburg; the archaeological finds confirm that there were close relations between Denmark and Southern Germany in the Bronze Age.
“In Bronze Age Western Europe, Southern Germany and Denmark were the two dominant centres of power, very similar to kingdoms. We find many direct connections between the two in the archaeological evidence, and my guess is that the Egtved Girl was a Southern German girl who was given in marriage to a man in Jutland so as to forge an alliance between two powerful families,” Kristian Kristiansen says.
According to him, Denmark was rich in amber and traded amber for bronze. In Mycenaean Greece and in the Middle East, Baltic amber was as coveted as gold, and, through middlemen in Southern Germany, large quantities of amber were transported to the Mediterranean, and large quantities of bronze came to Denmark as payment. In the Bronze Age, bronze was as valuable a raw material as oil is today so Denmark became one of the richest areas of Northern Europe.
“Amber was the engine of Bronze Age economy, and in order to keep the trade routes going, powerful families would forge alliances by giving their daughters in marriage to each other and letting their sons be raised by each other as a kind of security,” Kristian Kristiansen says.
A great number of Danish Bronze Age graves contain human remains that are as well-preserved as those found the Egtved Girl’s grave. Karin Margarita Frei and Kristian Kristiansen plan to examine these remains with a view to analysing their strontium isotope signatures.
The tools, whose makers may or may not have been some sort of human ancestor, push the known date of such tools back by 700,000 years; they also may challenge the notion that our own most direct ancestors were the first to bang two rocks together to create a new technology.
The discovery is the first evidence that an even earlier group of proto-humans may have had the thinking abilities needed to figure out how to make sharp-edged tools. The stone tools mark “a new beginning to the known archaeological record,” say the authors of a new paper about the discovery, published today in the leading scientific journal Nature.
“The whole site’s surprising, it just rewrites the book on a lot of things that we thought were true,” said geologist Chris Lepre of the Lamont-Doherty Earth Observatory and Rutgers University, a co-author of the paper who precisely dated the artifacts.
The tools “shed light on an unexpected and previously unknown period of hominin behavior and can tell us a lot about cognitive development in our ancestors that we can’t understand from fossils alone,” said lead author Sonia Harmand, of the Turkana Basin Institute at Stony Brook University and the Universite? Paris Ouest Nanterre.
Hominins are a group of species that includes modern humans, Homo sapiens, and our closest evolutionary ancestors. Anthropologists long thought that our relatives in the genus Homo – the line leading directly to Homo sapiens – were the first to craft such stone tools. But researchers have been uncovering tantalizing clues that some other, earlier species of hominin, distant cousins, if you will, might have figured it out.
The researchers do not know who made these oldest of tools. But earlier finds suggest a possible answer: The skull of a 3.3-million-year-old hominin, Kenyanthropus platytops, was found in 1999 about a kilometer from the tool site. A K. platyops tooth and a bone from a skull were discovered a few hundred meters away, and an as-yet unidentified tooth has been found about 100 meters away.
The precise family tree of modern humans is contentious, and so far, no one knows exactly how K. platyops relates to other hominin species. Kenyanthropus predates the earliest known Homo species by a half a million years. This species could have made the tools; or, the toolmaker could have been some other species from the same era, such as Australopithecus afarensis, or an as-yet undiscovered early type of Homo.
Lepre said a layer of volcanic ash below the tool site set a “floor” on the site’s age: It matched ash elsewhere that had been dated to about 3.3 million years ago, based on the ratio of argon isotopes in the material. To more sharply define the time period of the tools, Lepre and co-author and Lamont-Doherty colleague Dennis Kent examined magnetic minerals beneath, around and above the spots where the tools were found.
The Earth’s magnetic field periodically reverses itself, and the chronology of those changes is well documented going back millions of years. “We essentially have a magnetic tape recorder that records the magnetic field … the music of the outer core,” Kent said. By tracing the variations in the polarity of the samples, they dated the site to 3.33 million to 3.11 million years.
Lepre’s wife and another co-author, Rhoda Quinn of Rutgers, studied carbon isotopes in the soil, which along with animal fossils at the site allowed researchers to reconstruct the area’s vegetation. This led to another surprise: The area was at that time a partially wooded, shrubby environment. Conventional thinking has been that sophisticated tool-making came in response to a change in climate that led to the spread of broad savannah grasslands, and the consequent evolution of large groups of animals that could serve as a source of food for human ancestors.
One line of thinking is that hominins started knapping – banging one rock against another to make sharp-edged stones – so they could cut meat off of animal carcasses, said paper co-author Jason Lewis of the Turkana Basin Institute and Rutgers. But the size and markings of the newly discovered tools “suggest they were doing something different as well, especially if they were in a more wooded environment with access to various plant resources,” Lewis said. The researchers think the tools could have been used for breaking open nuts or tubers, bashing open dead logs to get at insects inside, or maybe something not yet thought of.
“The capabilities of our ancestors and the environmental forces leading to early stone technology are a great scientific mystery,” said Richard Potts, director of the Human Origins Program at the Smithsonian’s National Museum of Natural History, who was not involved in the research. The newly dated tools “begin to lift the veil on that mystery, at an earlier time than expected,” he said.
Potts said he had examined the stone tools during a visit to Kenya in February.
“Researchers have thought there must be some way of flaking stone that preceded the simplest tools known until now,” he said. “Harmand’s team shows us just what this even simpler altering of rocks looked like before technology became a fundamental part of early human behavior.”
Ancient stone artifacts from East Africa were first uncovered at Olduvai Gorge in Tanzania in the mid-20th century, and those tools were later associated with fossil discoveries in the 1960s of the early human ancestor Homo habilis. That species has been dated to 2.1 million to 1.5 million years ago.
Subsequent finds have pushed back the dates of humans’ evolutionary ancestors, and of stone tools, raising questions about who first made that cognitive leap. The discovery of a partial lower jaw in the Afar region of Ethiopia, announced on March 4, pushes the fossil record for the genus Homo to 2.8 million years ago. Evidence from recent papers, the authors note, suggests that there is anatomical evidence that Homo had evolved into several distinct lines by 2 million years ago.
There is some evidence of more primitive tool use going back even before the new find. In 2009, researchers at Dikika, Ethiopia, dug up 3.39 million-year-old animal bones marked with slashes and other cut marks, evidence that someone used stones to trim flesh from bone and perhaps crush bones to get at the marrow inside. That is the earliest evidence of meat and marrow consumption by hominins. No tools were found at the site, so it’s unclear whether the marks were made with crafted tools or simply sharp-edged stones. The only hominin fossil remains in the area dating to that time are from Australopithecus afarensis.
The new find came about almost by accident: Harmand and Lewis said that on the morning of July 9, 2011, they had wandered off on the wrong path, and climbed a hill to scout a fresh route back to their intended track. They wrote that they “could feel that something was special about this particular place.” They fanned out and surveyed a nearby patch of craggy outcrops. “By teatime,” they wrote, “local Turkana tribesman Sammy Lokorodi had helped [us] spot what [we] had come searching for.”
By the end of the 2012 field season, excavations at the site, named Lomekwi 3, had uncovered 149 stone artifacts tied to tool-making, from stone cores and flakes to rocks used for hammering and others possibly used as anvils to strike on.
The researchers tried knapping stones themselves to better understand how the tools they found might have been made. They concluded that the techniques used “could represent a technological stage between a hypothetical pounding-oriented stone tool use by an earlier hominin and the flaking-oriented knapping behavior of [later] toolmakers.” Chimpanzees and other primates are known to use a stone to hammer open nuts atop another stone. But using a stone for multiple purposes, and using one to crack apart another into a sharper tool, is more advanced behavior.
The find also has implications for understanding the evolution of the human brain. The toolmaking required a level of hand motor control that suggests that changes in the brain and spinal tract needed for such activity could have occurred before 3.3 million years ago, the authors said.
“This is a momentous and well-researched discovery,” said paleoanthropologist Bernard Wood of George Washington University, who was not involved in the study. “I have seen some of these artifacts in the flesh, and I am convinced they were fashioned deliberately.” Wood said he found it intriguing to see how different the tools are from so-called Oldowan stone tools, which up to now have been considered the oldest and most primitive.
Lepre, who has been conducting fieldwork in eastern Africa for about 15 years, said he arrived at the dig site about a week after the discovery. The site is several hours’ drive on rough roads from the nearest town, located in a hot, dry landscape he said is reminiscent of Arizona and New Mexico. Lepre collected chunks of sediment from a series of depths and brought them back to Lamont-Doherty for analysis. He and Kent used a bandsaw to trim the samples into sugar cube-size blocks and inserted them into a magnetometer, which measured the polarity of tiny grains of the minerals hematite and magnetite contained in the sediment.
“The magnetics pretty much clinches that the age is something like 3.3 million years old,” said Kent, who also is a professor at Rutgers.
Earlier dating work by Lepre and Kent helped lead to another landmark paper in 2011: a study that suggested Homo erectus, another precursor to modern humans, was using more advanced tool-making methods 1.8 million years ago, at least 300,000 years earlier than previously thought.
“I realized when you [figure out] these things, you don’t solve anything, you just open up new questions,” said Lepre. “I get excited, then realize there’s a lot more work to do.”
The Earth Institute at Columbia University – Header Image Credit: Sammy Lokorodi, a resident of Kenya’s northwestern desert who works as a fossil and artifact hunter, led the way to a trove of 3.3 million-year-old tools. – West Turkana Archaeological Project
The fossils were discovered while collecting ammonite fossils (a nautilus-like creature) from a marine rock unit known as the Cedar District Formation. The authors of the study describe the fossil as the partial left femur of a theropod dinosaur, the group of two-legged, carnivorous dinosaurs that includes Velociraptor, Tyrannosaurus rex, and modern birds. The fossil is 16.7 inches long and 8.7 inches wide, but would have been over three feet long when complete. The dinosaur is from the Late Cretaceous period and is approximately 80 million years old.
Although incomplete, the authors believe it is a theropod dinosaur femur due to the hollow middle cavity of the bone, where marrow was present, which is unique to theropods during this time period. The authors also point to a feature on the surface of the bone, the fourth trochanter, that is prominent and positioned relatively close to the hip, which is a combination of traits known only in some theropods among dinosaurs.
“This fossil won’t win a beauty contest,” lead author Dr. Sidor said. “But fortunately it preserves enough anatomy that we were able compare it to other dinosaurs and be confident of its identification.” “The fossil record of the West Coast is very spotty when compared to the rich record of the interior of North America,” said Peecook. “This specimen, though fragmentary, gives us insight into what the West Coast was like 80 million years ago, plus it gets Washington into the dinosaur club!”
Because the fossil is incomplete, paleontologists aren’t able to identify the exact family or species it belonged to. However, Drs. Sidor and Peecook compared the fossil to other specimens and were able to calculate and estimate that the complete femur would have been over a meter in length (1.17m)–slightly smaller than T. rex.
Fossilized prehistoric clams were also found inside the hollow part of the bone, which indicates the dinosaur fossilized in marine rock. These additional fossils are a rare occurrence, and provide scientists with a snapshot of other lifeforms that were present where the dinosaur fossilized. The accompanying fossilized clams are so well-preserved that Burke paleontologists were able to identify the clam species, Crassatellites conradiana. These clams lived in shallow water, so the authors suggest that it’s likely the dinosaur died near the sea, was tossed by the waves, and eventually came to rest among the clams.
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