A Circle of Stones in Peru and Twenty-Five Furnaces in Senegal: the Excavation Season Told Through Numbers

At Áspero, a coastal settlement in Peru, excavations have brought to light a complex of circular stone platforms that scholars interpret as an ancient astronomical observatory. The site is attributed to the Caral culture, among the oldest civilizations in the Americas, active between 3000 and 1800 BC. According to the reconstruction presented in the July-August 2026 issue of Archaeology Magazine, the journal of the Archaeological Institute of America, the platforms were used to track the movements of the sun, the moon and the stars: a calendar built in stone, useful for anticipating seasonal change, planning fishing activity and managing the resources of a stretch of coastline. The story currently comes from a single source (Archaeology Magazine, drawing on excavation reports); no independent confirmation available.

The interesting point is not astronomy in itself — observation of the sky is documented in nearly all ancient agricultural and seafaring societies — but the link that the interpretation establishes between celestial observation and economy. Áspero was a fishing center: if the excavators’ reading holds, the circular complex is not a sanctuary separate from material life, but a management tool. This is a line of research that in recent decades has shifted the center of gravity of Andean archaeology from the great ceremonial pyramids to the infrastructure of daily subsistence. It remains an interpretation, and should be read as such: the function of a stone alignment is argued, not directly measured.

More solid, because it is made of counts, is the second finding in the issue. At Didé West 1, in eastern Senegal, archaeologists have excavated the remains of twenty-five furnaces, thirty ventilation nozzles and one ton of metal slag. It is one of the oldest and best-preserved iron-working facilities in West Africa, and the materials offer new evidence on the origin and spread of that technology in the region. Here too the source is a single one, the same journal; no independent confirmation available.

A ton of slag is not a mere inventory detail: the amount of waste is the most direct measure of production volume, and it allows a distinction to be drawn between occasional domestic processing and an organized activity repeated over time. The open question, in the historiography of West Africa, concerns precisely whether and to what extent ironworking arose locally or came from elsewhere. A site with twenty-five furnaces shifts the discussion from the level of general hypotheses to that of datable excavation data.

On the other side of the profession — not the excavation but its presentation to the public — the Regional Archaeological Museum of Plovdiv opened on August 11, 2026 its annual exhibition “Discoveries 2025 – Threshold Between Worlds”, open to visitors through the end of the year. The exhibition brings together the most significant findings of the latest campaign conducted in the city and its surrounding territory, organized along two axes: daily life and the afterlife. This information, too, comes from a single source, the Bulgarian news agency BTA, drawing on the museum’s own announcement; no independent confirmation available.

The format of the annual exhibition deserves more attention than any single object on display. In most countries the public encounters a discovery years after the excavation, once scientific publication is complete. A fixed annual event showing the season just concluded shortens that gap and makes visible an activity that normally remains confined to storerooms. It comes at a cost: material still under study is put on display, with interpretations that remain provisional.

All three cases share a documentary fragility: none of them, as things stand, is corroborated by more than one independent source. For Áspero and Didé West 1, the next step will be the scientific publications of the respective excavation teams, which will make it possible to verify datings and measurements currently reported in popularized form.

Sources: Archaeology Magazine; BTA — Bulgarian News Agency.