Ancient ferns may have helped keep Triassic Europe burning by rapidly regrowing after fires and supplying fresh fuel for the next blaze. Around 201 million years ago, Earth was rocked by the end-Triassic mass extinction. The crisis has been linked to enormous volcanic activity associated with the breakup of Pangea. Those eruptions released huge quantities [...]
Stanford University scientists say experiments on ancient Chinese stone tools, including 15,000-year-old hand axes, have solved a longstanding mystery about the critical technological transition from rudimentary hand tools to more versatile ground-edged tools, suggesting these new technologies enabled uses beyond food harvesting.
The research team behind the new analysis said the discovery of ground-edged sickles and knives in Neolithic North China, likely used for fiber production and harvesting, combined with their replica-based experiments, highlights the growing technological capabilities of the transition between Paleolithic and Neolithic peoples.
“The combined experimental and archaeological evidence from the site of Peiligang indicates that the emergence of ground-edged tools marked a significant step in technological specialization from the Late Pleistocene to the Early Holocene,” the researchers write in a paper detailing the work.
According to lead author Ran Chen and colleagues, archaeologists widely regard ground-edged cutting tools like the modern sickle as “technological hallmarks of early agriculture in North China.” However, they note, the functional foundations of this advanced toolmaking capability “remain insufficiently tested.”
The research team also noted that most analyses of the transition from the Upper Paleolithic to the Early Neolithic (ca. 15,000–8,000 BP) in ancient China have viewed tools through “the lens of food production.”
“Within this framework, cutting tools, including early flakes and blades and later ground-edged sickles and knives, are often interpreted primarily as implements for harvesting cereals through cutting stems and leaves,” they explained.
The researchers said these earlier findings made them wonder whether this “food-focused perspective” could have led researchers to miss the broader range of plant resource exploitation possibilities in some of the 15,000-year-old stone tools previously discovered, prompting their replica-based experiments.
“The development of stone tool technology in North China provides a framework for reassessing this long-term relationship between plant use and technological change,” they explained.
To test their hypothesis, Chen and colleagues analyzed 140 stone artifacts previously collected from the Peiligang site in Henan Province, China. This included some 15,000-year-old Upper Paleolithic flaked stone tools and several more advanced Early Neolithic flaked and ground-edged stone tools.
Rather than test irreplaceable artifacts, the study authors created realistic experimental replicas.
Testing the effectiveness of the oldest, most rudimentary stone flake designs and the more technologically advanced ground-edged tools for harvesting seed-bearing grasses, the researchers found little measurable advantage between the two designs.
However, when the researchers compared the 15,000-year-old stone flake tools against ground-edged tools made thousands of years later, they found the more technologically advanced tools were “significantly more efficient at cutting thick-stemmed weeds and fiber-yielding plants.”
“Upper Paleolithic flaked tools were multifunctional implements used for processing diverse plant and animal materials, and Early Neolithic flakes continued to serve similarly flexible roles,” the study authors explain. “In contrast, Early Neolithic ground- edged tools show marked specialization in plant- related tasks.”
When discussing the experimental results, the team noted that their findings were supported by microfiber and starch residues found on some of the ancient tools, suggesting that “ground- edged sickles and knives were used not only for plant foods but also for harvesting and processing fibrous plants.”
“These findings indicate that ground- edged cutting tools emerged through broader functional demands, including fiber production, and potentially vegetation clearance, rather than cereal harvesting alone,” they explained.
Beyond the food-harvesting uses of ground-edged tools, Chen and colleagues said their identification of non-food plant labor like fiber production as an important driver of technological evolution and specialization “reframes the emergence of ground- edged tools as part of a broader technological and economic reorganization in early Holocene East Asia.”
“These findings identify nonfood plant work as an important contributor to the adoption of ground-edged cutting tools and show that tools conventionally linked to early agriculture were shaped by broader demands than food production alone,” they explained.
Finally, the study authors suggested that their analysis of 15,000-year-old Chinese stone tools could “invite renewed attention” to ancient fiber-based economies and nonfood plant use during forager–farmer transitions and in early farming societies beyond China.
The study “Plant fiber exploitation contributed to the emergence of ground-edged cutting tools in North China” was published in Proceedings of the National Academy of Sciences.
Christopher Plain has spent the last six years as Associate News Editor and Head Science Reporter at The Debrief. Follow and connect with him on X, learn about his novels at plainfiction.com, or email him at christopher@thedebrief.org.
A popular heart scan may be unnecessary for many patients but valuable for those whose risk is difficult to judge. Coronary artery calcium scanning has become an increasingly accessible way to refine estimates of heart attack and stroke risk. Yet a Northwestern Medicine study involving more than 6,000 adults suggests the quick, relatively inexpensive test [...]A material once thought to be nonmagnetic may reveal a hidden magnetic side when made just a few atomic layers thick. A newly proposed class of magnetism known as altermagnetism could open new possibilities for making computer memory smaller and more efficient. Now, researchers have found evidence that ruthenium dioxide, a quantum material long debated [...]Prehistoric builders in Britain went to extraordinary lengths to create one of the country’s most striking ancient monuments. New research shows they intentionally transported enormous stones weighing more than 25 tonnes for at least 18 kilometers (11 miles) before raising them as the famous Devil’s Arrows, Britain’s tallest surviving prehistoric stone row. A study led [...]Ancient teeth suggest humans were using psychoactive betel nuts 25,000 years ago, pushing the history of habitual drug use deep into the Ice Age. Archaeologists from Griffith University have found evidence suggesting that humans were using mind-altering substances far earlier than previously believed. The research team, led by Professor Adam Brumm of Griffith’s Australian Research [...]Astronomers once thought winds generated by supermassive black holes affected only their host galaxies, but a recent study found that their energy can also reach surrounding galaxies. Winds from a supermassive black hole can carry energy far beyond the galaxy that contains it. New observations show that this influence can extend roughly 300,000 light-years and [...]A Curtin University-led research team has successfully identified the mysterious origin of several 4,000-year-old 25-ton stones, which ancient architects used to construct Britain’s iconic Devil’s Arrows, as Birmingham Rocks in North Yorkshire, over 11 miles (18 kilometers) from the monument’s location.
The researcher behind the first-ever geological source identification of the ancient stone monument said the quarry’s distance and the work required to move such massive stones suggest the ancient architects intentionally selected the material used to construct Devil’s Arrows.
Announcing the discovery, the research team, which included scientists from the University of York, UK, noted that the famous stone pillars stand up to seven meters (22 feet) tall. The team also said the site is unusual because such alignments are rare in lowland settings. Still, researchers have struggled to locate the mysterious origin of the massive stone pillars used to create the over 4,000-year-old monument.
The Curtin-led team noted that previous studies determined that the stones used in Devil’s Arrows were transported to the site during the Late Neolithic or Early Bronze Age. This range means the site could have been constructed as early as 2000 BC.
Lead author Dr Anthony Clarke, from Curtin’s School of Earth and Planetary Sciences, noted the significant challenges with moving the stones over such difficult terrain.
“Each stone weighs more than 25 tonnes, so moving them would have required incredible planning, coordination and engineering skill,” the researcher explained.
Dr. Clarke also highlighted the value this effort suggests these ancient Britons “placed real importance” on the material used in the monument’s construction and the landscape itself.
“It wasn’t just about convenience – the location the stones came from likely held meaning for them,” the researcher explained.
To unravel the ancient site’s mysterious origin, the researchers placed tiny pieces of low-adhesion tape on the stones and then removed them. The team said this “low impact” sampling process collected several tiny mineral grains on the tape without measurable damage to the ancient monuments.
According to the statement announcing their solution to the Devil’s Arrows origin mystery, the team performed an analysis of the “fingerprints” of the selected grains. The results matched material from Brimham Rocks.
Critically, the mystery’s solution also addressed the possibility that glacial movement or other natural processes moved the stones over the needed distance. Instead, the team said their results demonstrated that “the stones were intentionally transported by people.”
“Our research shows these stones weren’t simply taken from the nearest available source – they were deliberately chosen from a challenging landscape 18 kilometers away,” Dr Clarke said.
Clarke also said that the results eliminate the nearer site of Plimpton Rocks, which “had previously been identified as the probable source of the stones.”
“Our findings instead point to Brimham Rocks, showing that prehistoric builders transported these enormous stones significantly further than thought,” he explained.
After discovering the mysterious origin of the 4,000-year-old pillars, Dr Clarke said the team will apply its low-impact sampling method to similar stone monument origin mysteries. The team also hopes to conduct future “targeted excavations” at the Devil’s Arrows site and the newly identified source.
Dr. Clarke said that analysis might help explain how these ancient architects moved the massive stone pillars several miles over rugged terrain over 4,000 years ago. The research said the work could also unravel “how these extraordinary monuments were constructed.”
Co-author Dr Jim Leary from the University of York echoed Dr Clarke’s sentiments, while also suggesting that the team’s findings ‘reshaped’ how researchers understand the art of prehistoric monument-building.
“These results show that ancient communities were making deliberate and meaningful choices about where their stones came from,” Dr Leary explained.
The York researcher said their solution to the Devil’s Arrows origin mystery also “highlights the importance of landscape and shared belief systems, as well as the remarkable effort involved in transporting and raising stones of this size.”
The study, “Deliberate Prehistoric Sourcing of the Devil’s Arrows, Britain’s Tallest Stone Row,” was published in the Proceedings of the Royal Society.
Christopher Plain has spent the last six years as Associate News Editor and Head Science Reporter at The Debrief. Follow and connect with him on X, learn about his novels at plainfiction.com, or email him at christopher@thedebrief.org.
Spirostomum uses a calcium-activated protein network to contract at remarkable speed without conventional muscle fibers. In less than five milliseconds, the aquatic single-celled organism Spirostomum ambiguum can shrink to one quarter of its body length, a movement hundreds of times faster than a human blink. Researchers have now traced that speed to an unusual calcium-activated [...]Using a new computational toolkit, Yale researchers recovered evolutionary clues from highly degraded DNA and identified two extinct lineages of giant tortoises. Some Galapagos giant tortoise specimens preserved in museums contained so little usable DNA that less than 1% of their genomes could be read. Yet Yale researchers were still able to recover enough genetic [...]A new image of the Helix Nebula reveals how dying stars return material to the galaxy. The Helix Nebula offers a rare look at what happens after a dying star releases its outer layers into space. New observations show fragments of that material colliding with surrounding gas, breaking apart, and beginning their return to the [...]Researchers developed a model showing how lava-covered planets close to their stars can hold onto their atmospheres, which could help guide the search for life beyond our solar system. Some planets orbit so close to their stars that intense radiation should strip away their atmospheres. Yet several of these scorching, lava-covered worlds still retain thick [...]Australian researchers have identified a promising new approach that could help stop one of the most aggressive forms of breast cancer from spreading. Triple-negative breast cancer becomes especially dangerous once tumor cells escape the breast and establish themselves elsewhere in the body. Australian researchers have now identified a molecular weakness that could eventually help determine [...]One sleepless night can blur the brain, but just 20 minutes of exercise or a well-timed nap may help new memories survive for days. In a McGill University-led study, participants who exercised for 20 minutes or slept for 90 minutes after prolonged wakefulness performed about 22 percent better on a delayed memory test than those [...]Princeton’s PACMAN AI can control fusion plasma in milliseconds and predict dangerous instabilities before they start. In some fusion energy systems, particles can reach temperatures hotter than the center of the Sun. The challenge is keeping that extreme plasma under control, because disturbances can develop within just a few thousandths of a second, much faster [...]
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