Discovering Technological Diversity in Prehistoric Western Europe

The recent publication in Quaternary Science Advances has shed new light on the stone tool technologies used by early humans in Western Europe around 400,000 years ago, during Marine Isotope Stage 11 (MIS 11, approximately 424,000 to 374,000 years before present). This interglacial period, following the harsh glacial conditions of MIS 12, is often seen as a pivotal moment in human evolution, marked by behavioral innovations that may link to the emergence of Neanderthals. Researchers from institutions like the Centro Nacional de Investigación sobre la Evolución Humana (CENIEH) in Spain and Sorbonne Université in France analyzed lithic assemblages—collections of stone tools and manufacturing debris—from dozens of sites to map how technologies evolved.

MIS 11 stands out for its duration and stability, with warmer climates promoting population expansion and more intensive land use. This environment likely fostered experimentation with tool-making, transitioning from Acheulean handaxes to more sophisticated methods. The study challenges the idea of a sudden 'revolution' at MIS 11, instead revealing gradual diversification rooted in earlier traditions.

Understanding MIS 11: A Key Interglacial in Human History

Marine Isotope Stages (MIS) are divisions of the Pleistocene epoch based on oxygen isotope ratios in ocean sediments, reflecting global climate cycles. MIS 11, spanning roughly 50,000 years, was one of the longest interglacials, with temperatures similar to or warmer than today. In Western Europe, this period saw increased archaeological evidence of human presence, from open-air sites to caves.

Post-MIS 12, populations re-expanded northward, leading to denser site distributions. Innovations included better fire control, diverse hunting strategies, and bone tools alongside stone ones. The study focuses on lithics, as they preserve well and reveal cognitive capabilities through manufacturing complexity.

The Cladistic Approach: Revolutionizing Lithic Analysis

Traditional comparisons of stone tools rely on typology or metrics, but the researchers employed cladistics—a method from biology for tracing evolutionary trees. Using 'three-item analysis' (3ia), they treated assemblages as 'taxa' and technological traits as hierarchical characters: core flaking methods (e.g., Levallois), large cutting tools (handaxes, cleavers), small tools (scrapers), and cluster proportions.

This quantitative method generated a single optimal cladogram from 40 assemblages, highlighting shared derived traits (synapomorphies). Retention index (RI=0.59) showed good phylogenetic signal, especially in flaking modes (RI=0.67). It revealed no strict north-south divide, suggesting mobility and cultural exchange.

Key Sites and Assemblages Under the Microscope

The database covers 47 layers from 42 sites across France, Spain, Italy, UK, Germany, and beyond. Notable examples include:

• Cagny-la-Garenne (France, MIS 13/12): Early centripetal cores.
• Gran Dolina TD10.1 (Spain, MIS 11-10): Diverse reduction systems.
• Aridos I & II (Spain, MIS 11): Transitional tech.
• Torre in Pietra (Italy, MIS 11): Levallois presence.
• La Micoque (France, MIS 11): Handaxe-focused.
• British sites like Happisburgh, showing isolated clades.

These span pre-MIS 11 (Acheulean dominance), MIS 11 (diversification), and post-MIS 11 (Levallois proliferation).

Levallois Technology: Survival and Diversification

Levallois cores, prepared for predetermined flakes, hallmark Middle Paleolithic. Contrary to views of MIS 11 debut, the cladogram shows Levallois homoplasy—multiple origins or convergences—predating MIS 12. It endured glacials via refugia, exploding in variety during MIS 11's stability.

Coexisting with discoidal and centripetal methods, it reflects adaptive flexibility. No single 'modern human' package emerges; diversity persists into MIS 9-8.

Photo by Markus Winkler on Unsplash

Regional Patterns: No Cultural Isolation

The pectinate cladogram splits Britannic from continental groups, but pairs northern (e.g., Cagny) with southern (Aridos) sites. Absence of endemism implies gene flow and idea exchange, challenging isolation models. Raw material pragmatism (local flint vs. quartzite) overrides cultural inheritance.

UK assemblages link via cores, not handaxes, suggesting maritime or overland contacts.

Links to Neanderthal Evolution and Behavior

MIS 11 coincides with archaic Neanderthal traits (e.g., La Chaise, France). Tech diversity mirrors anatomical mosaics: continuity from Homo heidelbergensis, innovations in subsistence (e.g., reindeer hunting). Fire mastery likely aided expansion.

Read the full study for cladogram details. Part of NEANDROOTS project exploring 450-350 ka threshold.

Climate's Role in Fostering Innovation

MIS 11's warmth (forest expansion, megaherbivores) enabled experimentation without survival pressure. Post-MIS 12 bottleneck selected resilient groups, whose descendants diversified tools. Stable climate facilitated knowledge transmission across latitudes.

Modern parallels: today's climate drives tech adaptation. European universities lead such interdisciplinary work; check Europe academic jobs.

From Acheulean to Middle Paleolithic: A Gradual Shift

Acheulean (handaxes) dominates pre-MIS 11; MIS 11 adds laminar flakes, blades. Levallois bridges to Neanderthal Mousterian. Study shows parallel evolutions, not replacement—key for understanding cultural transmission.

• Hierarchical cores increase complexity.
• Small tool retouch diversifies functions (scraping, piercing).
• No 'package' innovation; mosaic development.

Modern Methods Illuminating Ancient Minds

Cladistics, rare in archaeology, excels for hierarchical data like knapping sequences. Future: integrate morphometrics, use-wear, dating. Universities like CENIEH pioneer computational paleo.

Photo by NASA Hubble Space Telescope on Unsplash

Researchers and Institutions Driving Discovery

Lead: Valentin Rineau (Sorbonne), Paula García-Medrano (CENIEH/IPHES), Marie-Hélène Moncel (MNHP). NEANDROOTS (ANR-funded) unites French, Spanish, Italian teams. CENIEH's paleoanthropology hub exemplifies Europe's research excellence.

Opportunities abound: professor jobs, research positions in Europe.

Future Directions and Ongoing Debates

Refine chronologies with better dating; explore subsistence links. Does tech diversity predict Neanderthal success? Climate analogs warn of future human adaptability. Aspiring researchers, explore higher ed jobs, rate professors, university jobs.

This study underscores gradualism in evolution, inviting more cladistic applications. For careers in this field, visit higher ed career advice.