Tag: Archeology

Geodynamic shifts challenge Rujm el-Hiri’s role as an ancient observatory.

TAU research overturns myths about ancient copper pollution.

A new study from Tel Aviv University overturns prevailing scientific beliefs that King Solomon’s Mines not only harmed workers’ health in the ancient copper industry but also posed risks to the health of modern residents living near the site.

In the new study, researchers conducted geochemical surveys at copper production sites in the Timna Valley, dating back to the 10th century BCE and the era of the Biblical Kings David and Solomon. They found that the environmental pollution from copper production was minimal and spatially restricted, posing no danger to the region’s inhabitants in the past or today. Additionally, TAU’s archaeologists reviewed previous studies and found no evidence that the ancient copper industry polluted the planet.

The study was led by Prof. Erez Ben-Yosef, Dr. Omri Yagel, Willy Ondricek, and Dr. Aaron Greener from the Department of Archaeology and Ancient Near Eastern Cultures from The Lester & Sally Entin Faculty of Humanities at Tel Aviv University. The paper was published in the prestigious journal Scientific Reports by Nature.

Prof. Erez Ben-Yosef.

Did Ancient Copper Mines Really Cause Pollution?

“We inspected two major copper production sites in the Timna Valley, one from the Iron Age and King Solomon’s era and another nearby that is about 1,500 years older”, says Prof. Erez Ben-Yosef. “Our study was extensive.  We took hundreds of soil samples from both sites for chemical analyses, creating high-resolution maps of heavy metal presence in the region. We found that pollution levels at the Timna copper mining sites are extremely low and confined to the locations of the ancient smelting furnaces. For instance, the concentration of lead — the primary pollutant in metal industries — drops to less than 200 parts per million just a few meters from the furnace. By comparison, the U.S. Environmental Protection Agency defines industrial areas as safe for workers at 1,200 parts per million and residential areas as safe for children at 200 parts per million”.

The new study contradicts a series of papers published since the 1990s about pollution caused allegedly by the ancient copper industry. “We demonstrate that this is not true. Pollution in Timna is very restricted spatially, and only those working directly at the furnace likely suffered from inhaling toxic fumes, while just a short distance away, the soil is entirely safe. Moreover, the match we found between the spatial distribution of copper and lead concentrations in the soil further indicates that the metals are ‘trapped’ in slag and other industrial waste – which keeps them from leaching into the soil and affecting plants or humans. Our findings align with several recent studies from the Wadi Faynan region in Jordan, which also point to very low levels of pollution. Timna and Faynan are ideal sites for this type of research because they have not been disturbed by modern mining, as happened in Cyprus for example, and thanks to their dry climates the metals in the soil are not washed away. In Faynan, a team led by Prof. Yigal Erel of the Hebrew University examined 36 skeletons of people who lived at the mining site during the Iron Age, and only three showed any trace of pollution in their teeth. The rest were completely clean. We now present a similar picture for Timna”. In addition to the geochemical survey, the TAU archaeologists also conducted a comprehensive review of existing literature, pointing out that hypotheses about global pollution during the pre-Roman period lack solid evidence.

Dr. Omri Yagel recording the precise sampling location. 

Clearing the Record: Not What We Thought

“There was a trend in the 1990s, which presented ancient copper production as the first instance of industrial pollution”, explains Dr. Omri Yagel, a leading researcher in the current study. “Such statements grab headlines and attract research grants, but they unnecessarily project modern pollution problems onto the past. Moreover, the research literature tends to use the term ‘pollution’ to describe any trace of ancient metallurgical activity, and this has led to the mistaken assumption that metal industries were harmful to humans from their earliest beginnings — which is patently untrue. Even when metal production was large-scale, becoming integral to human civilization, it was the toxic lead industry that caused global pollution, not necessarily other metals. A 1990s study argued that traces of copper found in Greenland ice cores had traveled through the atmosphere from sites like Timna. This claim, however, has not been corroborated by any subsequent study.  As modern researchers grappling with the consequences of climate change, we have an inherent tendency to seek similar shifts in the past, but we must be careful. We may call a few pieces of slag lying on the ground ‘pollution’, but we should not confuse this local waste with regional or global environmental pollution”.

A rare discovery of early rituals in the levant.

A rare prehistoric ritual complex has been uncovered in the darkest depths of Manot Cave in Western Galilee, Israel. The complex is enclosed naturally by impressive stalagmites that create a distinctive entrance to the site and feature a unique and impressive rock with geometric engravings resembling a turtle shell. The study of this complex, published in the journal PNAS, was led by Dr. Omry Barzilai from the University of Haifa and Israel Antiquities Authority, Prof. Ofer Marder from Ben-Gurion University, and Prof. Israel Hershkovitz from Tel Aviv University.

“The rare discovery provides a glimpse into the spiritual world of Paleolithic hunter-gatherer groups who lived in our region approximately 35,000 years ago. The engraved rock was deliberately placed in a niche in the deepest, darkest part of the cave. The turtle-shell design, carved on a three-dimensional object, indicates that it may have represented a totem or a mythological or spiritual figure. Its special location, far from the daily activity areas near the cave entrance, suggests it was an object of worship. Notably, there are prehistoric caves in Western Europe, with similar findings testifying these places held symbolic importance and served for ritual and communal activities”, said Dr. Barzilai.

Research team (Left to right): Prof. Ofer Marder, Prof. Israel Hershkovitz & Dr. Omry Barzilai. Photo credit: Dr. Omry Barzilai.

Manot Cave has been excavated systematically since 2010 by the Israel Antiquities Authority, Tel Aviv University, and Ben-Gurion University. The cave is particularly well-known for its stunning stalactites and remains of habitation from several prehistoric cultures of the Upper Paleolithic period. Among its notable discoveries is a 55,000-year-old modern human skull, the oldest modern human fossil found outside Africa.

Ancient Rituals That Shaped Early Societies

In the course of study of the deep complex study, the researchers uncovered ash remains in one of the stalagmite rings near the engraved rock, confirming the use of fire to illuminate the ritual space, likely with torches. Acoustic tests revealed that the complex has enhanced natural acoustics, which could have created a unique auditory experience for communal activities such as prayer, singing, and dancing. Prof. Hershkovitz: “This is an unprecedented discovery of a space with ‘audio-visual equipment’ centered around a ritual object (the turtle), constituting the first evidence of communal rituals in the Levant. It is no surprise that prehistoric hunters chose to conduct their rituals in the darkest part of Manot Cave, as darkness embodies sacred and hidden qualities, symbolizing rebirth and renewal. Establishing ritual centers during the Upper Paleolithic was a central element in the development and institutionalization of collective identity — a necessary stage in the transition from small, isolated hunter-gatherer groups based on blood ties between individuals to large, complex societies”.

The chronological age of the ritual complex in Manot Cave was dated to 35,000–37,000 years ago, a period associated with the sudden emergence of the Aurignacian culture, known in Europe for its symbolic objects and cave paintings. “In our excavations in Manot Cave, we uncovered rich Aurignacian layers near the cave entrance that included flint tools, bone and antler implements, and shell beads”, said Prof. Ofer Marder from Ben-Gurion University.

In a small, hidden chamber adjacent to the ritual complex, a complete deer antler with signs of use was discovered. “Antlers were used as raw material for crafting tools for various purposes by Upper Paleolithic cultures in Europe, and by the Aurignacian culture in the Levant. The placement of the deer antler in a hidden chamber adjacent to the ritual site may be connected to the ritual activities in the cave”, explained Dr. Barzilai.

A deer beam from the hidden hall in Manot Cave (Photo credit: Dafna Gazit, Israel Antiquities Authority).

The geometric engravings found on the turtle shell-shaped rock were scanned with a unique confocal microscope capable of capturing extremely thin horizontal sections. “We identified fine micro-linear scratches inside some of the grooves, confirming without a doubt that the engravings are the work of human hands. These carvings are evidence of our ancestors’ artistic skills and their deep connection to rituals and symbols”, said Prof. Rachel Sarig from the Dental Medicine Laboratory at Tel Aviv University, who conducted the scans.

A turtle shell-shaped rock with geometric carvings (Photo credit: Clara Amit, Israel Antiquities Authority).

The researchers also conducted 3D photographic mapping of the cave. “We found a clear separation between the ritual complex and the areas of regular activity at the cave entrance. This observation strengthens the hypothesis about the significance of the complex and the need to differentiate it from the areas where daily activity took place”, said Alexander Wigman from the Israel Antiquities Authority.

According to the researchers, the discovery of the ritual complex in Manot Cave sheds new light on the spiritual life of the Upper Paleolithic people in the Levant. “This research enriches our understanding of prehistoric humans, their symbolic world, and the nature of the worship rituals that connected ancient communities. Identifying communal rituals in the Paleolithic era marks a breakthrough in our understanding of human society and offers more than just a glimpse into ancient ritual practices. It reveals the central role of rituals and symbols in shaping collective identity and strengthening social bonds”, the researchers concluded.

The Manot Cave project is supported by the Dan David Foundation, the Israel Science Foundation, the United States-Israel Binational Science Foundation, the Irene Levi Sala CARE Archaeological Foundation, and the Leakey Foundation. The research involved experts from the Israel Antiquities Authority, Cleveland State University, the Geological Survey of Israel, the Hebrew University of Jerusalem, the University of Haifa, Tel Aviv University, Ben-Gurion University, the University of Vienna, the University of Barcelona, the University of Siena, and Simon Fraser University.

TAU archaeologists reveal the Roman siege of Masada likely lasted weeks, not years, according to new research findings.

TAU study identifies tools developed by early humans for butchering fallow deer after elephants disappeared.

A new study from Tel Aviv University identified the earliest appearance worldwide of special stone tools, used 400,000 years ago to process fallow deer. The tools, called Quina scrapers (after the site in France where they were first discovered), were unearthed at the prehistoric sites of Jaljulia and Qesem Cave. They are characterized by a sharp working edge shaped as scales, enabling users to butcher their prey and also process its hides.

The researchers explain that after the elephants disappeared from the region, the ancient hunters were forced to make technological adaptations enabling them to hunt, butcher, and process much smaller and quicker game – fallow deer. The study also found that the unique tools were made of non-local flint procured from the Mountains of Samaria, which probably also served as the fallow deers’ calving area, about 20km east of Jaljulia and Qesem Cave. Consequently, the researchers hypothesize that Mounts Ebal and Gerizim (near Nablus of today) were considered a source of plenty and held sacred by prehistoric hunters as early as the Paleolithic period.

The study was led by Vlad Litov and Prof. Ran Barkai of Tel Aviv University’s Jacob M. Alkow Department of Archaeology and Ancient Near Eastern Cultures. The paper was published in Archaeologies.

Prof. Ran Barkai

The researchers explain that for about a million years, starting 1.5 million years ago, early humans used stone tools called scrapers to process hides and scrape the flesh off the bones of mostly large game. In the Levant, they mainly hunted elephants and other large herbivores that provided most of the calories they needed. The study found, however, that about 400,000 years ago, following the elephants’ disappearance, hunters turned to a different kind of prey, considerably smaller and quicker than elephants – fallow deer.

How Changing Diets Shaped Prehistoric Tools

Litov explains: “In this study, we tried to understand why stone tools changed during prehistoric times, with a focus on a technological change in scrapers in the Lower Paleolithic, about 400,000 years ago. We found a dramatic change in the human diet during this period, probably resulting from a change in the available fauna: the large game, particularly elephants, had disappeared, and humans were forced to hunt smaller animals, especially fallow deer. Clearly, butchering a large elephant is one thing, and processing a much smaller and more delicate fallow deer is quite a different challenge. Systematic processing of numerous fallow deer to compensate for a single elephant was a complex and demanding task that required the development of new implements. Consequently, we see the emergence of the new Quina scrapers, with a better-shaped, sharper, more uniform working edge compared to the simple scrapers used previously”.

A close look at a Quina-like scraper from Jaljulia.

The study relies on findings from an excavation at the Jaljulia prehistoric site next to Highway 6 in central Israel, probably inhabited by humans of the homo erectus species, as well as evidence from the nearby Qesem Cave. At both sites the excavators discovered many scrapers of the new type, made of non-local flint whose nearest sources are the western slopes of Samaria, to the east of the excavated sites, or today’s Ben Shemen Forest to the south.

Prof. Barkai adds: “In this study we identified links between technological developments and changes in the fauna hunted and consumed by early humans. For many years researchers believed that the changes in stone tools resulted from biological and cognitive changes in humans. We demonstrate a double connection, both practical and perceptual. On the one hand, humans started making more sophisticated tools because they had to hunt and butcher smaller, faster, thinner game. On the other, we identify a perceptual connection: Mounts Ebal and Gerizim in Samaria, about 20km east of Jaljulia, were a home range of fallow deer and thus considered a source of plenty. We found a connection between the plentiful source of fallow deer and the source of flint used to butcher them, and we believe that this link held perceptual significance for these prehistoric hunters. They knew where the fallow deer came from and made special efforts to use flint from the same area to make tools for butchering this prey. This behavior is familiar from many other places worldwide and is still widely practiced by native hunter-gatherer communities”.

Samaria’s Sacred Role in Early Tool Evolution

Litov concludes: “We believe that the Mountains of Samaria were sacred to the prehistoric people of Qesem Cave and Jaljulia because that’s where the fallow deer came from. It’s important to note that in Jaljulia we also found numerous other tools made of different kinds of locally-procured stones. When the locals realized that the elephant population was dwindling, they gradually shifted their focus to fallow deer. Identifying the deer’s plentiful source, they began to develop the unique scrapers in the same place. This is the earliest instance of a phenomenon that later spread throughout the world. The new scrapers first appeared at Jaljulia on a small scale, about 500,000 years ago, and a short time later, 400,000 to 200,000 years ago, on a much larger scale at Qesem Cave. The Samarian highlands east of Jaljulia and Qesem Cave were likely the home range of a fallow deer population, as evidenced by bone remains recovered from local archaeological sites throughout the Pleistocene and Holocene. Many fallow deer bones were also found at the altar site on Mount Gerizim, attributed in the Old Testament to Joshua bin Nun, and identified by some traditions as the place of Abraham’s Covenant of the Pieces described in the Book of Genesis. Apparently, the Mountains of Samaria gained a prominent, or even sacred status as early as the Paleolithic period and retained their unique cultural position for hundreds of thousands of years”.

Researchers rely on the earth’s magnetic field to verify an event mentioned in the Old Testament.

A breakthrough achieved by researchers from four Israeli universities – Tel Aviv University, The Hebrew University of Jerusalem, Bar-Ilan University and Ariel University– will enable archaeologists to identify burnt materials discovered in excavations and estimate their firing temperatures. Applying their method to findings from ancient Gath (Tell es-Safi in central Israel), the researchers validated the Biblical account: “About this time Hazael King of Aram went up and attacked Gath and captured it. Then he turned to attack Jerusalem” (2 Kings 12, 18). They explain that unlike previous methods, the new technique can determine whether a certain item (such as a mud brick) underwent a firing event even at relatively low temperatures, from 200°C and up. This information can be crucial for correctly interpreting the findings.

The multidisciplinary study was led by Dr. Yoav Vaknin from the Sonia & Marco Nadler Institute of Archaeology, Entin Faculty of Humanities, at Tel Aviv University, and the Palaeomagnetic Laboratory at The Hebrew University. Other contributors included: Prof. Ron Shaar from the Institute of Earth Sciences at The Hebrew University, Prof. Erez Ben-Yosef and Prof. Oded Lipschits from the Sonia & Marco Nadler Institute of Archaeology at Tel Aviv University, Prof. Aren Maeir from the Martin (Szusz) Department of Land of Israel Studies and Archaeology at Bar-Ilan University and Dr. Adi Eliyahu Behar from the Department of Land of Israel Studies and Archaeology and the Department of Chemical Sciences at Ariel University. The paper has been published in the scientific journal PLOS ONE.

Prof. Lipschits: “Throughout the Bronze and Iron Ages the main building material in most parts of the Land of Israel was mud bricks. This cheap and readily available material was used to build walls in most buildings, sometimes on top of stone foundations. That’s why it’s so important to understand the technology used in making these bricks.”

Dr. Vaknin adds: “During the same era dwellers of other lands, such as Mesopotamia where stone was hard to come by, would fire mud bricks in kilns to increase their strength and durability. This technique is mentioned in the story of the Tower of Babel in the Book of Genesis: “They said one to another, Come, let us make bricks and fire them thoroughly. So they used brick for stone”(Genesis 11, 3). Most researchers, however, believe that this technology did not reach the Land of Israel until much later, with the Roman conquest. Until that time the inhabitants used sun-dried mud bricks. Thus, when bricks are found in an archaeological excavation, several questions must be asked: First, have the bricks been fired, and if so, were they fired in a kiln prior to construction or in situ, in a destructive conflagration event? Our method can provide conclusive answers.”

The new method relies on measuring the magnetic field recorded and ‘locked’ in the brick as it burned and cooled down. Dr. Vaknin: “The clay from which the bricks were made contains millions of ferromagnetic particles – minerals with magnetic properties that behave like so many tiny ‘compasses’ or magnets. In a sun-dried mud brick the orientation of these magnets is almost random, so that they cancel out one another. Therefore, the overall magnetic signal of the brick is weak and not uniform. Heating to 200°C or more, as happens in a fire, releases the magnetic signals of these magnetic particles and, statistically, they tend to align with the earth’s magnetic field at that specific time and place. When the brick cools down, these magnetic signals remain locked in their new position and the brick attains a strong and uniformly oriented magnetic field, which can be measured with a magnetometer. This is a clear indication that the brick has, in fact, been fired.

One of the studied burnt mudbricks (Photo credit: Dr. Yoav Vaknin)

In the second stage of the procedure, the researchers gradually ‘erase’ the brick’s magnetic field, using a process called thermal demagnetization. This involves heating the brick in a special oven in a palaeomagnetic laboratory that neutralizes the earth’s magnetic field. The heat releases the magnetic signals, which once again arrange themselves randomly, canceling each other out, and the total magnetic signal becomes weak and loses its orientation.

Dr. Vaknin: “We conduct the process gradually. At first, we heat the sample to a temperature of 100°C, which releases the signals of only a small percentage of the magnetic minerals. We then cool it down and measure the remaining magnetic signal. We then repeat the procedure at temperatures of 150°C, 200°C, and so on, proceeding in small steps, up to 700°C. In this way the brick’s magnetic field is gradually erased. The temperature at which the signal of each mineral is ‘unlocked’ is approximately the same as the temperature at which it was initially ‘locked’, and ultimately, the temperature at which the magnetic field is fully erased was reached during the original fire.”

The researchers tested the technique in the laboratory: they fired mud bricks under controlled conditions of temperature and magnetic field, measured each brick’s acquired magnetic field, then gradually erased it. They found that the bricks were completely demagnetized at the temperature at which they had been burned – proving that the method works.

Dr. Vaknin: “Our approach enables identifying burning which occurred at much lower temperatures than any other method. Most techniques used for identifying burnt bricks are based on actual changes in the minerals, which usually occur at temperatures higher than 500°C – when some minerals are converted into others.”

Dr. Eliyahu Behar: “One of the common methods for identifying mineralogical changes in clay (the main component of mud bricks) due to exposure to high temperatures is based on changes in the absorption of infrared radiation by the various minerals. In this study we used this method as an additional tool to verify the results of the magnetic method.” Dr. Vaknin: “Our method is much more sensitive than others because it targets changes in the intensity and orientation of the magnetic signal, which occur at much lower temperatures. We can begin to detect changes in the magnetic signal at temperatures as low as 100°C, and from 200°C and up the findings are conclusive.”

In addition, the method can determine the orientation in which the bricks cooled down. Dr. Vaknin: “When a brick is fired in a kiln before construction, it records the direction of the earth’s magnetic field at that specific time and place. In Israel this means north and downward. But when builders take bricks from a kiln and build a wall, they lay them in random orientations, thus randomizing the recorded signals. On the other hand, when a wall is burned in-situ, as might happen when it is destroyed by an enemy, the magnetic fields of all bricks are locked in the same orientation.”

After proving the method’s validity, the researchers applied it to a specific archaeological dispute: was a specific brick structure discovered at Tell es-Safi – identified as the Philistine city of Gath, home of Goliath – built of pre-fired bricks or burned on location? The prevalent hypothesis, based on the Old Testament, historical sources, and Carbon-14 dating attributes the destruction of the structure to the devastation of Gath by Hazael, King of Aram Damascus, around 830 BCE. However, a previous paper by researchers including Prof. Maeir, head of the Tell es-Safi excavations, proposed that the building had not burned down, but rather collapsed over decades, and that the fired bricks found in the structure had been fired in a kiln prior to construction. If this hypothesis were correct, this would be the earliest instance of brick-firing technology discovered in the Land of Israel.

To settle the dispute, the current research team applied the new method to samples from the wall at Tell es-Safi and the collapsed debris found beside it. The findings were conclusive: the magnetic fields of all bricks and collapsed debris displayed the same orientation – north and downwards. Dr. Vaknin: “Our findings signify that the bricks burned and cooled down in-situ, right where they were found, namely in a conflagration in the structure itself, which collapsed within a few hours. Had the bricks been fired in a kiln and then laid in the wall, their magnetic orientations would have been random. Moreover, had the structure collapsed over time, not in a single fire event, the collapsed debris would have displayed random magnetic orientations. We believe that the main reason for our colleagues’ mistaken interpretation was their inability to identify burning at temperatures below 500°C. Since heat rises, materials at the bottom of the building burned at relatively low temperatures, below 400°C, and consequently the former study did not identify them as burnt – leading to the conclusion that the building had not been destroyed by fire. At the same time, bricks in upper parts of the wall, where temperatures were much higher, underwent mineralogical changes and were therefore identified as burnt – leading the researchers to conclude that they had been fired in a kiln prior to construction. Our method allowed us to determine that all bricks in both the wall and debris had burned during the conflagration: those at the bottom burned at relatively low temperatures, and those that were found in higher layers or had fallen from the top –at temperatures higher than 600°C.”

Prof. Maeir: “Our findings are very important for deciphering the intensity of the fire and scope of destruction at Gath, the largest and most powerful city in the Land of Israel at the time, as well as understanding the building methods prevailing in that era. It’s important to review conclusions from previous studies, and sometimes even refute former interpretations, even if they came from your own school.” Prof. Ben-Yosef adds: “Beyond their historical and archaeological significance, ancient building methods also had substantial ecological implications. The brick firing technology requires vast quantities of combustive materials, and in ancient times this might have led to vast deforestation and even loss of tree species in the area. For example, certain species of trees and shrubs exploited by the ancient copper industry in the Timna Valley have not recovered to this day and the industry itself ultimately collapsed once it had used up its natural fuels. Our findings indicate that the brick firing technology was probably not practiced in the Land of Israel in the times of the Kings of Judah and Israel.”