The Mysterious Limestone Spheroids of ’Ubeidiya: Unlocking the Secrets of an Ancient Puzzle

Limestone Spheroids

Recent research indicates that ancient limestone spheroids were intentionally crafted with advanced skills by early hominins, challenging previous beliefs. The study, utilizing 3D analysis, suggests these spheroids may represent the earliest known instance of hominins achieving intentional symmetry in stone tool crafting. Credit: Muller et al.

For years, the mysterious limestone spheroids—ancient, enigmatic stone relics—have baffled archaeologists. Dating back from the Oldowan era to the Middle Palaeolithic period, the exact reasons behind their creation continue to be a fiercely debated topic.

Spheroids are among the most enduring yet least understood archaeological artifacts, often considered by-products of percussive tasks. However, the team’s research challenges this conventional wisdom. The central question at the heart of this study is whether these spheroids were unintentional by-products or intentionally crafted tools designed for specific purposes.

The research team meticulously reconstructed the spheroid reduction sequence based on the trends observed in scar facets and geometry. Their findings revealed a remarkable pattern: the spheroids at ‘Ubeidiya were crafted with a premeditated reduction strategy. Contrary to the notion that they were accidental by-products, the spheroids did not become smoother during their manufacture; instead, they became markedly more spherical. This transformation towards an ideal sphere required exceptional knapping skills and a clear preconceived goal.

This discovery challenges existing beliefs about the capabilities of early hominins and their relationship with technology. While Acheulean bifaces are traditionally thought to represent the earliest evidence of hominins imposing intentional, symmetrical shapes on stone, the intentional production of sphere-like objects at ‘Ubeidiya similarly suggests that these early hominins had a desire for and achieved intentional geometry and symmetry in stone. Slightly older spheroids exist at sites in Africa. If this same intentionality can be demonstrated there, this would represent the oldest evidence of hominins desiring and achieving symmetrical shapes in stone.

The team’s research opens new avenues for understanding the cognitive abilities and technological achievements of our distant ancestors. It also raises questions about the purpose and significance of these spheroids in the daily lives of early hominins.

Reference: “The limestone spheroids of ‘Ubeidiya: intentional imposition of symmetric geometry by early hominins?” by Antoine Muller, Deborah Barsky, Robert Sala-Ramos, Gonen Sharon, Stefania Titton, Josep-Maria Vergès and Leore Grosman, 6 September 2023, Royal Society Open Science.
DOI: 10.1098/rsos.230671