Welcome back, everybody!  This is Rick Pettigrew, to hand off our four top news stories from this past week of Archaeologica.  Send us feedback on The Archaeology Channel Facebook page or post a message on our social networking site, ArchaeoSeek!

Archaeologists in the country of Georgia surprisingly have identified traces of indigo from 34,000 years ago on ground stone tools.  A 9000-year-old site in the West African country of Senegal stands out with intact stratification and a tool kit including microliths.  A large cluster of Iron Age burial mounds in Kazakhstan may come from a culture still unknown to archaeologists.  And a small sculpture of two frogs in Peru highlights the cultural importance of amphibians for people in the Caral civilization, the oldest complex society in the Americas.

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And now, here’s Laura Kennedy with the Audio News from Archaeologica!  We hope you find this to be a valuable part of your day!

Welcome to the Audio News from Archaeologica!  I’m Laura Kennedy, and these are the headlines in archaeological and historical news for the week of August 31st through September 6th, 2025.

Our first story this week comes from the Caucasus in Georgia, where researchers have identified traces of blue dye on stone tools dating back 34,000 years.  The new study provides insights into how early humans discovered complex uses for plants beyond food.

As reported by Phys.org, an international team of archaeologists led by Ca’ Foscari [KAH fosc-AR-ee] University of Venice conducted the study on ground stone tools.  In the two thousands, previous researchers had excavated the tools from a layer of sediment belonging to the Paleolithic era.  

The new study discovered the compound indigotin [in-di-GO-tin], better known as indigo, on the tools.  The indigo substance comes from the leaves of the woad plant, which is inedible but has long been recognized for its uses in dyeing and medicine. 

The discovery marks the earliest known instance of human-processed indigo.  The evidence suggests that the plant was deliberately collected and refined, which indicates that Upper Paleolithic groups were experimenting with plant resources for uses other than food.

Researchers determined that the stone tools were used to work with soft materials such as leaves, as the materials left behind microscopic traces of blue fibers and starch grains.

Further analysis confirmed that the porous surfaces of the tools helped preserve these residues for thousands of years.  To verify their results, the team conducted experiments with raw pebbles and freshly harvested woad over the course of three summers.  They replicated the same kinds of wear patterns and plant residue that were seen on the stone tools.  This allowed them to build a reference collection.

The discovery sheds new light on the resourcefulness of early modern humans.  Rather than relying on plants for only subsistence, these groups created processing methods that may have served purposes such as dyeing materials or creating medicinal compounds.  These conclusions push back the timeline of plant-based technologies and highlight the cultural sophistication of Paleolithic communities. 

The team’s findings are published in the journal PLOS One.

Next, we head to Senegal in West Africa, where archaeologists are uncovering new details about the region’s last hunter-gatherer populations, including a workshop that reveals their advanced toolmaking techniques.

As reported by Phys.org, researchers from the University of Geneva conducting excavations at the Ravin Blanc X site in Falémé [fuh-LAY-may] Valley have revealed a 9,000-year-old quartz-knapping workshop dating back to the early Holocene period.  The site also contains a preserved fireplace, providing a rare window into the lives of prehistoric communities in this part of the continent. 

Though archaeologists have extensively documented hunter-gatherer groups in Europe, Asia and parts of Africa, evidence from West Africa is scarce due to poor preservation of stratified remains.  This discovery stands out for its remarkable condition, having remained undisturbed from the time when it was buried beneath later Neolithic layers until now. 

The team found no tools, as the hunter-gatherers removed them from the site.  However, they were able to reconstruct the workshop by piecing together quartz flakes and cores, demonstrating the knappers’ skill and careful selection of high-quality materials. 

The team’s discoveries help show how West African hunter-gatherers produced microliths, which are small stone tools designed to be attached to hunting weapons.  Comparison with other sites suggests that communities living in savannah environments developed standardized, highly sophisticated toolmaking traditions.  On the other hand, groups living in tropical forests employed more spontaneous techniques, suggesting clear cultural differences depending on the environment. 

The interdisciplinary study extended beyond stone tools.  Researchers analyzed charcoal from the fireplace to identify wood species and examined soils for microscopic plant remains that reveal aspects of the ancient climate and vegetation.  Together, these results illuminate both the daily practices and the broader environmental setting of these mobile communities.

Researchers argue that the Ravin Blanc X site captures a pivotal moment in West Africa’s prehistory, when human groups were navigating cultural, climatic and environmental transformations at the dawn of the Holocene.

The team’s findings are published in the journal PLOS One.

Our third story takes us to Kazakhstan, where archaeologists have uncovered a large cluster of ancient burial mounds on the Central Asian steppe.  These mounds point toward an unknown civilization.

As detailed by the Greek Reporter, researchers working in the West Kazakhstan Region identified about 150 mounds that are tightly concentrated in a single area.  The mounds display a diversity of shapes and designs, including circular, rectangular and even rare double-ring formations.  Such features are seldom seen in steppe archaeology. 

Preliminary analysis suggests that the site dates to the Early Iron Age, in the first millennium BC.   It may be related to the Sarmatians, an ancient Iranian equestrian society related to the Scythians.  However, archaeologists claim that the scale and variety of the structures raise the possibility that they may have belonged to an unidentified culture. 

Researchers emphasize that the discovery stands apart from typical Iron Age burial sites in its scope and complexity.  For instance, one of the largest mounds is surrounded by a moat nearly 140 meters in diameter, leading archaeologists to believe it may have marked the burial of a person of high social or ceremonial status. 

The site already holds cultural significance for the local communities, who have regarded it as a mysterious and potentially sacred place for years, full of stories of incredible phenomena. 

Before full excavations can begin, the project must gain official approval and secure funding.  Confirmation of the site’s importance means that it may be added to Kazakhstan’s registry of protected cultural monuments. 

This discovery comes amid a wave of archaeological findings across Kazakhstan, including Golden Horde coins in the Atyrau Region and an Iron Age warrior burial in Ulytau [oo-lee-TOW].  Experts believe that the West Kazakhstan mounds could significantly reshape our understanding of the region’s ancient past. 

We end this week in the Huaura [HWAH-oo-rah] Valley in Peru, where archaeologists have uncovered a unique frog sculpture that sheds light on the symbolic world of the Caral [ka-RAL] civilization, the oldest known complex society in the Americas.

As reported by Popular Science, Caral was an advanced society that existed almost 5,000 years ago across an estimated 30 urban centers.  The discovery of the statuette at Vichama, about 68 miles north of Lima, is the first of its kind at a Caral site.  The statue is 4.7 inches long and depicts two frogs joined together at the hind legs.  This find highlights the cultural importance of amphibians, which the Caral people associated with water, rainfall and agricultural cycles. 

Vichama, an urban center of the Caral culture that flourished around 1800 BC, has been the focus of 18 years of archaeological excavation and study.  The site contains at least 28 major structures, including public buildings, homes and ceremonial plazas.

Archaeologists claim that many of these buildings were organized to support agriculture and fishing.  Researchers also unearthed clay models of buildings that reveal the Caral people’s sophisticated approach to urban planning and symbolism. 

The frog sculpture complements other works found at Vichama.  One example is a series of mural reliefs known as the “Dance of Life and Death,” which depict emaciated figures, pregnant women, dancers, and fish.  Another work is a carving of a toad with human hands, called the “Humanized Toad.”  Researchers suggest that these artworks reflect themes of scarcity, abundance and renewal in terms of climatic and ecological cycles. 

Archaeologists at the site say that these cultural expressions were not only artistic but also served as ideological messages.  The artwork reminded future generations of the need for communal resilience during times of hardship.  Researchers also point out that the struggles the Caral people faced can resonate with today’s environmental challenges, so their art is a mirror for modern society.

That wraps up the news for this week!

For more stories and daily news updates, visit Archaeologica on the World Wide Web at www.archaeologica.org where all the news is history! Also, be sure to check out our growing subscription platform, Heritage Broadcasting Service, at heritagetac.org!

I’m Laura Kennedy and I’ll see you next week!