Evolutionary Insights by Anthropology.net

A Fossil That Refused to Sit Still

When Sahelanthropus tchadensis was first described in the early 2000s, it arrived with a skull and a question. Was this strange, flat faced ape an early member of the human lineage or simply an extinct cousin that happened to resemble us?

At roughly seven million years old, Sahelanthropus sits close to the estimated split between humans and chimpanzees. If it walked on two legs, it would push the origin of bipedalism to the very base of our family tree.

For years, the debate hinged on skull anatomy and on fragmentary limb bones whose meaning was hotly contested. A new study in Science Advances shifts the discussion from speculation to structure.

Reading Movement in Bone

Scott Williams and his colleagues focused on the femur and ulnae of Sahelanthropus, using detailed 3D analyses and comparisons with both living apes and fossil hominins. What they found was a small but decisive feature.

On the femur sits a bump known as the femoral tubercle. In humans and other hominins, it anchors the iliofemoral ligament, the strongest ligament in the body. This ligament stabilizes the hip during upright walking. It has not been identified in non bipedal apes.

The researchers found that Sahelanthropus had one.

“The presence of a femoral tubercle provides direct evidence for habitual bipedalism,” the authors report, noting that this feature is unique to hominins.

This was not the only clue.

A Body Built for Two Worlds

The team confirmed two additional traits linked to upright walking. The first is femoral antetorsion, a natural twist in the thigh bone that helps align the legs for forward motion. The second is the structure of the gluteal muscles, which help keep the pelvis stable while standing and walking.

Together, these features place Sahelanthropus firmly within the range of early hominins like Australopithecus, though it remained distinct from later forms.

The proportions of the limbs tell a similar story. Apes tend to have long arms and short legs. Hominins shift toward longer legs. Sahelanthropus sits in between, with a femur longer than expected for an ape but shorter than in modern Homo sapiens.

Williams describes the animal this way:

“Sahelanthropus tchadensis was essentially a bipedal ape that possessed a chimpanzee sized brain and likely spent a significant portion of its time in trees.”

It walked upright on the ground but still climbed when it needed to.

Rethinking the First Steps

The implication of this work is not that Sahelanthropus looked or moved like a modern human. It did not. Instead, it suggests that bipedalism emerged in a creature that still retained many ape like traits.

This fits with a growing picture of early human evolution as a patchwork. Traits did not appear all at once. Upright walking came before big brains, stone tools, or long distance running.

“Despite its superficial appearance, Sahelanthropus was adapted to using bipedal posture and movement on the ground,” Williams explains.

The earliest steps toward humanity may have been taken by an ape that looked nothing like us from the neck up.

Why This Matters

Bipedalism is often treated as the defining feature of the human lineage. Finding solid evidence for it at seven million years ago reshapes the timeline of our origins.

It suggests that the last common ancestor of humans and chimpanzees may already have been experimenting with upright walking. It also reminds us that evolution does not wait for perfection. It works with what is available.

In the case of Sahelanthropus tchadensis, that meant standing up while still clinging to the trees.

Further Reading

* Lovejoy, C. O. 2009. Reexamining human origins in light of Ardipithecus. Science.

* Richmond, B. G. and Jungers, W. L. 2008. Orrorin tugenensis femoral morphology. Journal of Human Evolution.

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A Hearth Where There Should Not Be One

Archaeology often moves forward by millimeters. A trowel nicks an unusual surface. A researcher pauses before brushing away another layer. At Barnham, a Paleolithic site tucked into eastern England, those small moments eventually coalesced into something profound: the oldest convincing evidence that ancient hominins were not just tending fire, but making it.

The study, published in Nature, pushes deliberate fire-making back to roughly 400,000 years ago. Until now, the earliest secure evidence rested around 50,000 years ago. The gap between those dates is not just chronological. It is conceptual. Fire-making marks a shift from opportunism to mastery, from waiting for lightning to acting with intention.

As one researcher put it:

“A controlled flame is not simply a tool but a signal of planning, knowledge, and social cohesion,” notes Dr. Mara Ellingsen, a Paleolithic fire-use specialist at Aarhus University. “Its presence implies minds capable of anticipating needs long before the moment of need arrives.”

Barnham’s quiet sediments held that signal for hundreds of millennia. What finally brought it to light was a streak of clay, oddly reddened, and a set of flints that seemed fractured by forces far hotter than seasonal brushfires could provide.

Those details opened a path into the deep past, toward a group of early Neanderthals who gathered beside a watering hole and learned to make fire spark on command.

A Landscape That Should Have Erased Everything

The challenge with ancient fire is not that early humans failed to use it. It is that fire rarely leaves a dependable signature. Ash disperses. Charcoal crumbles. Sediment shifts and buries or scatters what a hearth once contained. Many of the earliest traces of fire consist of burned animal bones or small pockets of heated material, ambiguous enough that scholars debate whether people created them or simply capitalized on natural lightning strikes.

That ambiguity has weighed heavily on interpretations of early fire behavior. Humans and premodern hominins clearly exploited fire long before 400,000 years ago. Sites across Africa contain bones charred between 1 and 1.5 million years old, possibly from cooking or waste disposal. But those sites do not demonstrate fire-making itself. They could represent opportunistic use of landscape fires, a behavior well within the reach of hominins who recognized the value of a smoldering branch.

The distinction matters. Opportunistic fire-use depends on ecological luck. Fire-making depends on knowledge. It suggests intentionality, transfer of skills, and an understanding of materials that goes beyond happenstance.

At Barnham, researchers needed to determine whether the burned sediments were natural or cultural. Their analysis took years and relied on geochemistry, field experiments, and painstaking excavation. Layer by layer, they reconstructed a long-vanished pond, a stable gathering point for both animals and humans. What they uncovered contradicted any explanation tied to lightning or wildfire.

Repeated burning occurred at the same spot over decades. The fires reached temperatures well over 700 degrees Celsius. The burn layer was neatly contained rather than spread across the broader landscape.

Those patterns pointed to a hearth rather than a natural blaze. Yet the deciding clue was geological, not thermal.

A Mineral That Should Not Have Been There

Two small fragments of pyrite were the final pieces of evidence. When struck against flint, pyrite produces bright sparks, a technique known ethnographically from hunter-gatherer societies around the world. Pyrite does not occur naturally at Barnham. The nearest known source lies roughly forty miles away.

The presence of imported pyrite changed the conversation. It implied deliberate transport. It also suggested an understanding that certain stones could be used not simply to shape tools, but to create fire itself.

A scholar familiar with Paleolithic pyrotechnology reflected on this point:

“The movement of pyrite into a site where it does not belong indicates a mental map of materials and their properties,” says Dr. Silvio Marro, an archaeologist at the University of Barcelona. “Such knowledge requires teaching and repeated practice rather than chance discovery.”

The combination of pyrite flakes, heat-shattered flints, localized burning, and recurring use transformed Barnham from an ordinary Pleistocene locality into a window on an emergent technology. Fire-making did not appear suddenly. It emerged gradually, likely unevenly, across different populations. Some Neanderthal groups may never have adopted the technique. Others, like those at Barnham, may have practiced it for generations.

The uneven distribution of fire-making is consistent with cultural behavior rather than biological necessity. Knowledge spreads socially, often unpredictably, and can be lost as easily as it is gained.

What Fire-Making Meant for Ancient Hominins

To understand the significance of Barnham, it helps to consider what controlled fire provided. It expanded dietary breadth by rendering tough roots edible and neutralizing toxins. It made meat safer, boosted caloric returns, and allowed groups to occupy cooler environments. Fire also restructured social life. Evenings around a hearth created space for shared attention, storytelling, and planning. Many researchers argue that such gatherings fostered the cognitive landscapes in which language and symbolic culture could grow.

But the Barnham findings push these dynamics further back in time, into a period when early Neanderthals and their close relatives were experimenting with increasingly sophisticated behaviors.

By 400,000 years ago, brain sizes across Europe and parts of Africa were approaching levels comparable to modern humans. Stone tool industries were diversifying. Sites in Britain, Spain, France, and Israel show complex patterns of mobility and resource use.

Fire-making fits within that growing behavioral repertoire.

One paleoanthropologist commented:

“Fire use is both a practical skill and a social performance,” explains Dr. Karen Oduro of the Max Planck Institute for Evolutionary Anthropology. “Its practice reinforces group identity, teaches coordination, and shapes how time is spent. A controlled fire becomes a focal point through which knowledge and relationships are maintained.”

Fire-making also altered how humans interacted with the landscape. It provided the predictability that nature often denied. A group no longer needed to wait for lightning or wander in search of embers. A spark could be summoned whenever an evening cooled or a meal required cooking.

Some researchers believe that fire-making may have spread widely across Neanderthals, Denisovans, and early Homo sapiens long before 50,000 years ago. Others are more cautious, noting the scarcity of unambiguous evidence.

Barnham does not resolve that debate. But it sharpens the frame through which archaeologists evaluate ancient fire traces and underscores the potential for other early hearths to be preserved in overlooked sediments worldwide.

The Mystery of How Widespread Fire-Making Was

The Barnham findings prompt a broader question: did other populations 400,000 years ago know how to make fire, or was Barnham an outlier?

Some experts propose that the technique may have originated in pockets before spreading socially. Others argue that a lack of archaeological visibility obscures a long and widespread tradition of fire-making. Wildfires can mimic human ones. Human fires can vanish without a trace. The line between evidence and absence is razor-thin.

But the site also reminds researchers that archaeology is often limited by the constraints of preservation and chance. If a small burned patch survived at Barnham, it might survive elsewhere. If pyrite flakes escaped erosion here, they might do so again.

The discovery does not rewrite everything known about ancient fire use, but it forces a reconsideration of how early controlled fire might have emerged, persisted, and circulated among hominin groups.

Related Studies

* Roebroeks, W., et al. (2012). “Use of fire in the Lower and Middle Palaeolithic: A review.” Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1117620109

A foundational analysis of early fire traces and challenges in identifying deliberate fire use.

* Sorensen, A., et al. (2018). “Neanderthal fire-making technology inferred from microwear analysis.” Scientific Reports. https://doi.org/10.1038/s41598-018-24340-6

Microwear evidence suggesting Neanderthals used pyrite and flint to generate sparks at multiple European sites.

* Shimelmitz, R., et al. (2014). “Evidence for the repeated use of a central hearth at Qesem Cave.” Journal of Human Evolution. https://doi.org/10.1016/j.jhevol.2014.06.002

Documents stable hearth use in Israel around 300,000 to 400,000 years ago, offering comparative context for the Barnham findings.

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A Cave Steeped in Deep Time

La Pileta Cave in southern Spain is more than a dark hollow in the limestone hills of Málaga province. Inside its twisting passages, walls shimmer with images painted and carved by Homo sapiens across tens of thousands of years—horses, ibex, serpentine symbols, and human silhouettes stretching back to the Upper Paleolithic and forward into the Bronze Age. Discovered in 1905 and protected as a Spanish National Monument since 1924, La Pileta has long been recognized as a “cathedral” of Iberian prehistory.

The cave also contains a remarkable archaeological sequence spanning more than 100 millennia. Among its finds is a small lamp with traces of pigment from the Gravettian period, thought to be one of the oldest lighting devices on the Iberian Peninsula. Yet until recently, no digital model captured the full extent of this site’s features in three dimensions.

A New Approach to Ancient Walls

In a study published in the Journal of Archaeological Science, a team from the University of Seville combined two types of laser scanning to map La Pileta Cave: a high-end terrestrial laser scanner and the LiDAR sensor embedded in an off-the-shelf smartphone. This pairing, at first glance improbable, allowed them to create a validated 3D model of the entire cave with remarkable precision.

“The complementarity of both systems made it possible to obtain a complete and validated 3D model, with minimum margin of error with respect to topographic reference points,” the researchers write.

While the terrestrial scanner provided a far-reaching, high-resolution metric backbone, the smartphone LiDAR excelled in tight, irregular passages inaccessible to bulky tripods. Its portability also allowed rapid data collection across multiple sessions.

“Using the mobile LiDAR offered versatility and access to narrow and difficult-to-reach areas, while still capturing high-quality textures,” the team notes.

What the Lasers Reveal

The resulting 3D model captures the morphology of the cave and the placement of its rock art—thousands of motifs spanning millennia. Animal figures, abstract symbols, and human silhouettes emerge as digital surfaces that can be rotated, measured, and explored virtually.

Scanning while suspended by rope 1. Credit: Journal of Archaeological Science (2025). DOI: 10.1016/j.jas.2025.106330

The model supports more than documentation. It opens the door to preventive conservation, allowing researchers to monitor erosion, vandalism, or humidity damage over time. It also provides a foundation for public outreach and immersive education, enabling students and visitors to experience a site closed or restricted to most travelers.

Caves as Living Archives

La Pileta’s new digital map underscores how caves serve as living archives of deep human history. Because such sites accumulate cultural layers over tens of millennia, their preservation and accurate recording are critical. By combining everyday technology with established field methods, archaeologists can now bring hidden spaces to light without disturbing them.

“This model reinforces and complements archaeological work, providing new tools for understanding, preserving and disseminating cultural heritage,” concludes the team.

Looking Forward

Smartphone-based LiDAR will not replace traditional fieldwork or high-resolution scanning, but it offers a nimble, low-cost complement for archaeological and speleological research worldwide. In regions where budgets or access limit large-scale surveys, pocket-sized laser sensors may extend the reach of documentation and democratize high-quality 3D recording.

Related Research

* Forte, M., & Campana, S. (2022). “3D technologies for heritage and archaeology: A decade of progress.” Journal of Archaeological Science: Reports, 43, 103465. https://doi.org/10.1016/j.jasrep.2022.103465

* Bruno, F., et al. (2020). “Virtual tours and rock art heritage: Immersive technologies for inaccessible sites.” Heritage Science, 8(1), 73. https://doi.org/10.1186/s40494-020-00414-y

* De Reu, J., et al. (2013). “Applications of 3D recording in archaeology: The examples of Ghent University.” Journal of Archaeological Science, 40(12), 4450–4460. https://doi.org/10.1016/j.jas.2013.06.038

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For generations, archaeologists have traced early human migrations into Europe through familiar corridors: the Balkans, the Levant, and the shores of the Mediterranean. Yet the northeastern Aegean, dotted with olive groves and seaside towns, has remained an archaeological blank spot. Now a new survey of Ayvalık on Turkey’s northwestern coast points to a Paleolithic landscape where Homo sapiens and possibly Neanderthals moved, hunted, and crafted tools during periods of low sea level when today’s islands formed a single continuous plain.

“Ayvalık’s present-day islands and peninsulas would have been interior zones within an expansive terrestrial environment,” says Professor Kadriye Özçelik of Ankara University. “These paleogeographic reconstructions underscore the importance of the region for understanding hominin dispersals across the northeastern Aegean during the Pleistocene.”

Lost Landscapes and Exposed Corridors

During glacial maxima, sea levels in the Aegean dropped by over 100 meters. What is now a patchwork of islands once stretched as a wide land corridor connecting Anatolia and Europe. Bulut and colleagues surveyed more than 200 square kilometers across this terrain, identifying ten sites and cataloging 138 stone artifacts.

Among these were Levallois flakes, handaxes, and cleavers—technologies linked to the Middle Paleolithic Mousterian tradition and used by Neanderthals as well as early Homo sapiens. Such finds suggest that Ayvalık was not a marginal area but a strategic point for mobility, resource access, and possibly contact between populations.

“These large cutting tools are among the most iconic artifacts of the Paleolithic,” notes Dr. Göknur Karahan of Hacettepe University. “Their presence in Ayvalık provides direct evidence that the region was part of wider technological traditions shared across Africa, Asia, and Europe.”

Tools That Travelled, People Who Adapted

The lithic assemblage revealed more than mere presence; it documented technological continuity. Levallois cores, prepared flakes, and retouched implements show a diversified toolkit. Flint and chalcedony were sourced locally, but the consistency of the assemblage with broader Aegean and Anatolian industries suggests knowledge networks stretching beyond the immediate region.

“The findings paint a vivid picture of early human adaptation, innovation, and mobility along the Aegean,” Karahan explains. “Ayvalık, which had never before been studied for its Paleolithic potential, holds vital traces of early human activity.”

A Region Hidden in Plain Sight

Archaeological visibility in Ayvalık has long been hindered by active coastlines, alluvial deposition, and urban development. Yet even a brief survey in 2022 produced a striking record. The team traversed muddy lowlands and coastal plains, identifying high-quality raw material sources, including flint nodules exposed by erosion. These conditions hint at more extensive Paleolithic deposits still buried under sediments or submerged offshore.

Dr. Hande Bulut of Düzce University emphasizes that the discovery is only the beginning:

“Ultimately, the results underline Ayvalık’s potential as a long-term hominin habitat and a key area for understanding Paleolithic technological features in the eastern Aegean.”

Implications for Human Migration

The Ayvalık findings challenge the simplicity of established migration models. Rather than a single northern or southern route, early humans may have moved through multiple corridors, each opening and closing with the rhythms of glacial and interglacial periods. The evidence also underscores the resilience and adaptability of Paleolithic populations to changing coastlines and shifting ecologies.

Future research will need absolute dating, stratigraphic excavation, and paleoenvironmental reconstruction to clarify the temporal depth of the Ayvalık assemblage. Still, the survey offers a tantalizing glimpse of a missing chapter in the story of human dispersal.

Related Research

* Harvati, K., et al. (2019). “Apidima Cave fossils provide earliest evidence of Homo sapiens in Eurasia.” Nature, 571(7766), 500–504. https://doi.org/10.1038/s41586-019-1376-z

* Çiner, A., et al. (2021). “Sea-level changes and submerged prehistoric landscapes in the Aegean.” Quaternary International, 585, 70–83. https://doi.org/10.1016/j.quaint.2020.08.010

* Karkanas, P., & Douka, K. (2023). “Eastern Mediterranean corridors in early human dispersals.” Journal of Human Evolution, 176, 103305. https://doi.org/10.1016/j.jhevol.2023.103305

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A Palace on the Edge of an Empire

In the foothills of modern-day Tajikistan, 12 kilometers east of Panjikent, archaeologists have been piecing together a royal residence once at the heart of the Sogdian world. Known today as Sanjar-Shah, the palace belonged to a society that thrived as city-states along the arteries of the Silk Road. The Sogdians — merchants, colonists, and civic innovators — linked China, India, and Persia, trading not only goods but also religious and artistic traditions.

Constructed in the 5th century AD and later expanded under the Umayyads, the palace at Sanjar-Shah mirrored other Sogdian complexes: reception halls arranged around a T-shaped corridor, Chinese mirrors, and imported belt buckles hinting at elite status and far-reaching connections. Destroyed by fire in the third quarter of the 8th century, the palace was later subdivided by peasants during the early Samanid period.

Murals of a Lost Religion

Among the debris, archaeologists have uncovered fragments of once-monumental murals. Scenes of blue lotus flowers and hunting parties echo the decorative style of Panjikent’s famed wall paintings. But in 2022–2023, researchers recovered something different — 30 fragments forming a procession of four priests and a child moving toward a stationary fire altar.

“The first priest is seen kneeling before the fire altar, offering up a smaller altar to the larger one,” notes Dr. Michael Shenkar, lead author of the study published in Antiquity. This act mirrors familiar gestures in Sogdian art, where worshipers present incense to sacred flames.

Such depictions are almost exclusively known from funerary ossuaries — and normally only show two priests, not four. This makes the Sanjar-Shah mural unique.

Sacred Fire and Ritual Attire

The mural also preserves an extraordinary detail of ritual costume. One priest wears a padām — a mouth covering still used by Zoroastrian priests today — meant to prevent human breath from polluting the sacred flame.

“It is a ritual mouth covering worn by priests to prevent their breath from polluting the sacred fire during religious ceremonies,” Shenkar explains.

Another priest features a puzzling ribbon tied at the back of his neck — a motif more often associated with divine or royal figures.

“At present, I am unable to provide a satisfactory explanation for the presence of the ribbon on the second priest figure. As this motif is conventionally associated with divine or royal imagery, its occurrence in this context remains problematic,” Shenkar adds.

Fire in the Sogdian Imagination

The discovery at Sanjar-Shah illuminates how Zoroastrian fire worship adapted in a Silk Road context. The Sogdians, predominantly Iranian-speaking and practicing forms of Zoroastrianism, were famous for their artistic synthesis of Persian, Indian, and Central Asian motifs. Yet direct depictions of ritual fire within palatial contexts — rather than funerary ones — have been exceedingly rare.

By situating sacred fire at the heart of a royal palace, the mural suggests that fire cults may have been woven into elite ceremonial life. It also demonstrates how religious and political authority could overlap — the palace as a stage for ritual as much as for governance.

A Vanished World

By the late 8th century, Sanjar-Shah’s palace was destroyed and its murals buried beneath rubble. The rise of Islam and the decline of Sogdian city-states shifted the region’s religious landscape. Yet in these fragments — priests frozen mid-procession, the sacred flame steady at center stage — a world of ritual and belief flickers to life again.

Related Research

* Grenet, F. (2015). Zoroastrianism on the Silk Road. Bulletin of the Asia Institute, 25, 1–18.

* Shenkar, M. (2019). Intangible fire: Sogdian religious iconography in its historical context. Iranica Antiqua, 54, 193–215. https://doi.org/10.2143/IA.54.0.3285044

* Canepa, M. P. (2018). The Iranian Expanse: Transforming Royal Identity Through Architecture, Landscape, and the Built Environment, 550 BCE–642 CE. University of California Press.

* Marshak, B. I. (2002). Legends, Tales, and Fables in the Art of Sogdiana. Markus Wiener Publishers.

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In the foothills of the Pavlovské vrchy mountains of southern Moravia, archaeologists uncovered a quiet moment in time: a hunter’s toolkit from the Gravettian period, carefully bundled, forgotten, and buried for some 30,000 years. This is not a cache of ritual offerings or a communal workshop. It is the intimate record of a single person’s gear, frozen in soil and charcoal.

The assemblage, published in Journal of Paleolithic Archaeology, contains 29 stone tools — blades, points, scrapers and fragments — each one showing the signature wear of use and re-use. Together, they provide a portrait of a hunter-gatherer whose survival depended on mobility, adaptability and memory of distant landscapes.

A Toolkit Unearthed

The discovery at Milovice IV, in the Czech Republic, came from a collapsed cellar first exposed in 2009 and systematically excavated over the following decade. Beneath layers of Pleistocene sediments, researchers led by Dominik Chlachula found traces of hearths, bones of horse and reindeer, and, at the heart of the site, the tightly grouped stone artefacts.

“The artefacts were positioned as though still wrapped in a leather pouch that had long since decayed,” the authors report.

This configuration is what makes the find so unusual. Rather than scattered debris from a workshop, the arrangement suggests a personal kit — a portable toolkit carried on the move.

How a Gravettian Hunter Worked

Close analysis revealed blades dulled by scraping hides and cutting bone, points broken at the tips of spears or arrows, and evidence of hafting. Many of the tools had been reworked from older pieces, implying a strategy of recycling and repair rather than discard.

Some stones tell of journeys far beyond Moravia. Roughly two-thirds of the flint came from glacial deposits over 130 kilometers to the north; other pieces originated in western Slovakia, 100 kilometers to the southeast. Whether these stones were collected directly or acquired through exchange remains unknown, but the distances point to extensive mobility or wide-reaching social ties.

“Several pieces were too worn or broken to be functional,” Chlachula explains in the paper. “It is possible the hunter kept them for future recycling — or perhaps for their symbolic or personal value.”

Mobility and Memory in the Ice Age

The Gravettian period, stretching from roughly 33,000 to 24,000 years ago, represents one of the most distinctive Upper Paleolithic traditions in Europe. These were the makers of the famed Venus figurines, the artists of Pavlovian engravings, and the hunters of mammoth-rich plains. Yet their personal tools are rarely found intact.

This kit from Milovice IV is more than an assortment of stone. It reflects the rhythm of seasonal rounds, the pathways across river valleys and uplands, and the mental maps needed to locate high-quality stone. It also shows how intimate and durable a single pouch of tools could be in Ice Age life.

What Archaeologists Learn from Personal Gear

The discovery brings a level of granularity to Upper Paleolithic life often lost in larger excavations. It allows archaeologists to reconstruct how a single person prepared for travel, hunted, and maintained equipment. This kind of evidence also challenges stereotypes of “disposable” Stone Age tools. Reuse and recycling were central strategies long before agriculture.

It also invites questions about ownership and identity. Was this kit abandoned in haste? Left behind as a personal cache? Or lost when its owner did not return?

Related Research

* Verpoorte, A. (2009). Gravettian lithic technology at Pavlov and Dolní Věstonice. Journal of Archaeological Science, 36(3), 993–1005. https://doi.org/10.1016/j.jas.2008.11.002

* Svoboda, J. A. (2016). Dolní Věstonice–Pavlov: New excavations and findings. Quaternary International, 415, 254–266. https://doi.org/10.1016/j.quaint.2015.11.063

* Zupancich, A., Cristiani, E., et al. (2022). Use-wear and residue analysis of Gravettian stone tools. Journal of Archaeological Method and Theory, 29, 427–451. https://doi.org/10.1007/s10816-021-09540-z

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The First Truly Global Material

Stone, bronze, and iron all defined earlier chapters of human history, but they emerged regionally and spread unevenly across the globe. Plastic is different. It appeared almost everywhere at once in the mid-20th century. By the 1950s, plastics had entered households from São Paulo to Shanghai, joining the fabric of daily life with astonishing speed.

A new study in Cambridge Prisms: Plastics contends that plastics are more than an environmental crisis — they’re also the defining material of a new archaeological era.

“It is easy to view plastics as a toxic legacy and the cause of environmental harm, which — of course — they are,” explains Professor John Schofield of the University of York. “But as archaeologists, we can also view them from another angle entirely — as a valuable archive that documents human impacts on planetary health.”

Reading an Archive Made of Waste

Unlike pottery sherds or bronze blades, plastic artifacts are still largely in circulation. Yet every bottle cap, bag, or synthetic fiber that moves from use to discard leaves a material trace, one that can persist far longer than the societies that produced it. Microplastics now drift in the stratosphere, sink to the ocean floor, and lodge in soils, plants, and human tissue.

The research team argues that this diffusion turns plastics into a kind of global stratigraphic marker — a future “layer” of our planet’s crust.

“Plastics are everywhere — from the deep ocean to high mountains — so are ubiquitous, resilient, and toxic as they continually break down, eventually to nanoscale,” Schofield notes. “We question how society should view an archaeological record that represents such a valuable archive documenting activities and behaviors at a crucial time in human history, while at the same time being a dangerous contaminant.”

The Archaeology of Us

Archaeology has long concerned itself with the deep past, but in recent years it has widened its scope to contemporary material culture — a field some scholars call the “archaeology of us.” The Schofield team places plastics squarely within this movement, proposing that archaeologists track not only the accumulation of plastics but also their journeys from production to discard.

Professor Alice Gorman of Flinders University, a co-author on the study, emphasizes that this archive extends beyond Earth.

“Our aim is to show how plastics are more than just pollution — they’re a record of human behavior in the contemporary world that extends from the deepest oceans to the furthest reaches of the solar system, everywhere that spacecraft have traveled. There are even plastics on the moon.”

A Planet-Wide Era

Unlike the Bronze Age or Iron Age, the so-called “Plastic Age” began nearly simultaneously worldwide. It is enmeshed with larger planetary processes — fossil fuel extraction, industrialization, mass consumerism, and climate change. The researchers point out that this synchronicity makes plastics unique as a marker of human activity.

The study also suggests practical steps. By identifying the point at which plastics transition from use to discard, archaeologists could help inform interventions to reduce pollution and conserve ecosystems.

What Future Archaeologists Might Find

If archaeologists 10,000 years from now dig through 21st-century sediments, they will find traces of how humans ate, traveled, dressed, and built their lives — all through synthetic polymers. In much the same way ancient refuse heaps reveal diets and trade networks, our discarded plastic will map our cities, migration, and economies.

Schofield and colleagues see this record as both a warning and an opportunity: an archive of our impact and a guide to how future generations might understand — or mitigate — what we have left behind.

“We need this archive, both to help us understand and try to reduce our impacts now, but also to ensure people can understand these impacts in the future,” Schofield says.

Related Research

* Zalasiewicz, J., Waters, C. N., Williams, M., & Summerhayes, C. (2019). The Anthropocene as a geological time unit. Nature, 573(7773), 221–225. https://doi.org/10.1038/s41586-019-0338-4

* Ford, A., & Clarke, A. (2019). “The archaeology of the contemporary past.” Annual Review of Anthropology, 48, 359–374. https://doi.org/10.1146/annurev-anthro-102218-011318

* orman, A. C. (2020). Dr Space Junk vs The Universe: Archaeology and the Future. MIT Press.

* Turner, A., & Arnold, R. (2018). “Plastics in the archaeological record.” Environmental Archaeology, 23(2), 106–119. https://doi.org/10.1080/14614103.2016.1260087

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Quartz Under Pressure

Around 12,800 years ago, mammoths, mastodons, and saber-toothed cats still roamed North America. Then they vanished. Alongside them disappeared one of the continent’s most recognizable archaeological traditions: the Clovis technocomplex, defined by its fluted spear points and large-scale hunting strategies.

A new study in PLOS One (Kennett et al. 2025) reports quartz grains deformed by pressures and temperatures far beyond what volcanoes or wildfires can produce. The grains come from three sites central to Clovis archaeology: Murray Springs in Arizona, Blackwater Draw in New Mexico, and Arlington Canyon on California’s Channel Islands.

“These three sites were classic in the discovery and documentation of the megafaunal extinctions in North America and the disappearance of the Clovis culture,” explains James Kennett, emeritus professor of Earth Science at UC Santa Barbara.

The team argues that the quartz offers a new proxy for a dramatic event at the Younger Dryas onset — an abrupt return to near ice-age conditions that reshaped ecosystems across the Northern Hemisphere.

Cosmic Airbursts and the Younger Dryas

The Younger Dryas began just as the last glacial period was giving way to a warmer climate. Its onset coincides with both megafaunal extinctions and the disappearance of Clovis technology. Several explanations have been proposed, from meltwater pulses to volcanic activity. Kennett and colleagues point to another culprit: a fragmented comet that exploded over North America.

“All hell broke loose,” Kennett said in earlier remarks about the hypothesis. According to this scenario, low-altitude airbursts sent shock waves and intense heat across the landscape, igniting fires and injecting soot and dust into the atmosphere.

Unlike asteroid strikes that gouge craters into the Earth, airbursts leave few visible scars. But they do leave microscopic ones — etched into minerals like quartz.

Reading the Rocks

Shocked quartz is often called the “smoking gun” of cosmic impacts. Under normal conditions, quartz grains are stable. Under extraordinary pressure, their crystal lattices fracture along distinct planes, sometimes filling with melted silica.

Kennett’s team used electron microscopy and cathodoluminescence to study these grains. They found features consistent with extreme pressures and temperatures, beyond anything known from volcanism or human technology.

“There are going to be some very highly shocked grains and some that will be low-shocked. That’s what you would expect from an airburst rather than a single crater-forming impact,” Kennett noted.

The shocked grains occur in the same sedimentary layer that contains other impact proxies: carbon-rich “black mats,” nanodiamonds, metallic spherules, and meltglass.

Why It Matters for Archaeology

If correct, the findings help explain why the Clovis technocomplex collapsed so suddenly. Airbursts could have destroyed habitats, altered prey availability, and destabilized the societies built around them.

For archaeologists, the discovery underscores the importance of fine-grained geoarchaeological work at classic sites. Microscopic minerals can rewrite narratives built on spear points and mammoth bones.

The study also highlights the global stakes of cosmic events. Similar black mats and impact proxies have been found at sites in Europe and South America, hinting at a hemispheric or even global phenomenon.

Reassessing the End of an Era

The Younger Dryas impact hypothesis remains debated. Critics argue that alternative processes, like wildfires or volcanic eruptions, could produce some of the same proxies. But the shocked quartz adds a new layer of evidence to the puzzle.

Whether by comet or climate, the world of Homo sapiens at the end of the Pleistocene was transformed. The Clovis hunters and the animals they pursued vanished into deep time, leaving behind stones, bones, and now, microscopic scars of a sky that may once have exploded.

Related Research

* Bunch, T. E. et al. (2012). “Very high-temperature impact melt products as evidence for cosmic airbursts and impacts 12,900 years ago.” PNAS. https://doi.org/10.1073/pnas.1204453109

* Wittke, J. H. et al. (2013). “Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago.” PNAS. https://doi.org/10.1073/pnas.1301760110

* Kennett, J. P. et al. (2009). “Impact-related younger Dryas boundary layer.” Science. https://doi.org/10.1126/science.1166197

* Moore, C. R. et al. (2021). “Sedimentary proxies for the Younger Dryas impact hypothesis.” Scientific Reports. https://doi.org/10.1038/s41598-021-99373-6

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Seeds in the Rock

On the island of Gran Canaria, farmers long ago carved grain silos into volcanic bedrock. In these hidden chambers, lentils sat undisturbed for centuries. Shielded from heat and moisture, their DNA persisted — a time capsule of a food tradition spanning two millennia.

A new study published in the Journal of Archaeological Science (Hagenblad et al. 2025) uses ancient DNA from these lentils to explore how Indigenous islanders, North African migrants, and European settlers shaped one another’s food systems.

“The same type of lentils has been cultivated for almost 2,000 years in the Canary Islands,” says Jenny Hagenblad, senior associate professor at Linköping University. “New settlers adopted the Indigenous people’s crops and continued to grow them.”

A Crop Older Than Colonization

European ships reached the Canaries in the 14th century, but the islands had been inhabited for over a thousand years by peoples of North African origin. Written sources from early European encounters describe local agriculture but rarely mention lentils. The new genetic evidence shows that lentils were part of the islands’ story long before Europeans arrived.

The team compared DNA from lentils excavated from rock-cut silos with contemporary samples from Spain, Morocco, and the Canaries. The genetic match shows that many lentil varieties grown on the islands today descend directly from seeds brought by the first settlers from North Africa around the 3rd century CE.

Women as Knowledge Keepers

Archaeologists and ethnobotanists note that plant traditions are often preserved through household knowledge. The research team suggests that Indigenous women may have played a key role in transmitting lentil cultivation, especially as intermarriage occurred after colonization.

“Indigenous women, who married immigrating men, likely played an important role in preserving the knowledge of which crops to grow,” the authors write.

Even today, Canarian women retain a disproportionate share of agricultural knowledge — a living echo of how plants and people entwined over generations.

Lentils as Climate Archives

The lentils’ endurance is more than a cultural curiosity. Varieties adapted to the Canaries’ dry climate may offer valuable genetic diversity for future agriculture. As global temperatures climb and rainfall patterns shift, seeds with deep local adaptation are increasingly prized by plant breeders.

Jonathan Santana, researcher at the University of Las Palmas de Gran Canaria, emphasizes that diversity exists not only between the islands and mainland but also among the islands themselves.

“We see in our study that different types of lentils are grown on different islands — even islands where it was previously thought that lentils were never cultivated,” Santana explains. “It’s important to preserve lentils from different islands, because genetic diversity can prove valuable for the future of agriculture.”

The Curious Case of Lanzarote Lentils

One of the study’s surprises involves the “Lenteja tipo Lanzarote,” a common label in Spanish shops. Despite the name, these lentils are not produced on Lanzarote itself. Genetic analysis shows that lentils from Lanzarote have cross-bred with Spanish mainland varieties, contributing both name and genes to Spain’s lentil stock.

Jacob Morales, associate professor at the University of Las Palmas de Gran Canaria, points to the broader significance:

“With the climate change that is now taking place, Canarian lentils, adapted to growing in dry and warm conditions, may be of great interest for future plant breeding.”

Archaeology Meets Food Heritage

This study adds to a growing field where ancient DNA from plants is used to reconstruct past diets, farming systems, and cultural exchanges. The Canary Islands case underscores that colonization did not erase Indigenous foodways entirely. Instead, crops and knowledge flowed across generations, surviving conquest, migration, and globalization.

For archaeologists, this work highlights how even small, seemingly mundane finds — a charred seed, a lentil in a silo — can speak to centuries of continuity and change.

Related Research

* Fuller, D.Q. et al. (2014). “Convergent evolution and parallelism in plant domestication revealed by archaeobotany and genetics.” PNAS. https://doi.org/10.1073/pnas.1308937110

* Ramos-Madrigal, J. et al. (2019). “Palaeogenomic insights into the origins of the domesticated horse.” Science Advances. https://doi.org/10.1126/sciadv.aav9138

* Wales, N. et al. (2014). “Ancient DNA reveals the timing and persistence of barley cultivation on the island of Bornholm.” Holocene. https://doi.org/10.1177/0959683613519685

* Morales, J., & Santana, J. (2020). “Pre-Hispanic agriculture and food in the Canary Islands.” Vegetation History and Archaeobotany. https://doi.org/10.1007/s00334-020-00778-0

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The Tropical Puzzle in Our DNA

Long before Homo sapiens left Africa, another hominin was roaming Eurasia. Denisovans, an extinct branch of our genus, inhabited a mosaic of landscapes stretching from the Siberian taiga to the subtropical forests of Southeast Asia. Their genes persist in modern humans, especially in Melanesia and Southeast Asia, where traces of Denisovan ancestry rise above 5 percent. But why do these archaic alleles persist — and why are they linked to immunity?

A new study by Attila Trájer in the Journal of Human Evolution takes a different approach to this question: instead of focusing only on the genes, it reconstructs the environments Denisovans lived in, then compares them to the immune-related DNA we still carry.

“The Denisovan genetic legacy is particularly high among present-day Melanesians and some Indigenous Philippine groups. Their ancient habitats may explain why we see certain immune alleles in these populations today,” writes Trájer.

Mapping the Paleohabitats

The study models three confirmed Denisovan sites: Denisova Cave in Siberia, Baishiya Karst Cave on the Tibetan Plateau, and Tam Ngu Hao 2 (“Cobra Cave”) in Laos. Each site tells a different ecological story.

* Denisova Cave: Subarctic boreal forest, seasonal extremes, and tick-borne disease risk.

* Baishiya Karst Cave: High-altitude monsoon-influenced subarctic environment, cold but with pulses of moisture.

* Tam Ngu Hao 2 Cave: Humid subtropical setting with monsoon rains, likely rich in mosquitoes, helminths, and other parasites.

“The Cobra Cave site stands out as a tropical or subtropical environment with optimal conditions for disease transmission,” Trájer reports.

By modeling paleoclimate and known ranges of eight disease vectors (including Plasmodium vivax, Ixodes ticks, and Aedes albopictus mosquitoes), Trájer shows that Denisovan populations were likely exposed to radically different pathogen communities depending on geography. Siberian Denisovans contended with cold-weather zoonoses such as tick-borne encephalitis and Lyme borreliosis, while the Laotian Denisovans faced malaria, helminths, and Nipah-like viruses.

Ancient Immunity, Modern Consequences

The research highlights specific Denisovan-derived immune alleles such as HLA-H*02:07 and toll-like receptor variants still present in modern populations. These genes shape how the body recognizes viruses, bacteria, and parasites.

“Denisovan habitats shaped modern human disease resistance,” Trájer writes, noting that introgressed alleles may have balanced pathogen defense with autoimmune risks.

Populations in Melanesia today exhibit high frequencies of these alleles, yet live in regions without the cold-weather pathogens of Siberia. This suggests the inherited alleles may have been selected in tropical or monsoon climates — precisely the conditions reconstructed at the Cobra Cave site.

Why This Matters for Anthropologists and Archaeologists

This approach bridges two fields often kept apart: paleoecology and immunogenetics. Instead of treating Denisovans as a static genome donor, it reframes them as living organisms responding to disease landscapes — much like hunter-gatherers today. It also deepens debates over the timing and routes of archaic-human dispersals into Southeast Asia.

The study further suggests that Denisovan cytochrome P450 gene variants, known for metabolizing plant and animal toxins, may have helped them survive in biodiverse environments teeming with venomous snakes, poisonous plants, and mosquito-borne parasites.

Rethinking Human Evolution as an Immunological Process

For archaeologists, the implications are clear: sites are not just dots on a map. They’re embedded in ecosystems that left molecular fingerprints in our DNA. Future excavations at Southeast Asian caves may reveal not only stone tools or teeth but also isotopic signatures and microfossils of pathogens, shedding light on the coevolution of hominins and disease.

“The Denisovan and shared archaic heritage of these alleles highlights how ancient gene variants continue to shape the modern immune landscape,” Trájer notes.

Related Research

* Vernot et al. (2016). “Excavating Neandertal and Denisovan DNA from the genomes of Melanesians.” Science. https://doi.org/10.1126/science.aad9416

* Larena et al. (2021). “Multiple deeply divergent Denisovan ancestries in Papuans.” Nature Ecology & Evolution. https://doi.org/10.1038/s41559-020-1127-1

* Dannemann, M., & Kelso, J. (2017). “The contribution of Neanderthals to phenotypic variation in modern humans.” American Journal of Human Genetics. https://doi.org/10.1016/j.ajhg.2017.09.001

* Hubert et al. (2022). “Denisovan introgression and immune gene adaptation in modern humans.” PNAS. https://doi.org/10.1073/pnas.2102859119

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