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- Close to sunlight or deep underground? New data to reconstruct site formation processes at the Middle Paleolithic Escoural cave (southern Portugal)Publication . Alzate-Casallas, Guillermo Alfonso; Gomes, Ana; Ferar, Nolan; Talamo, Sahra; Tassoni, Laura; Cascalheira, João; Barbieri, AlviseThe ability to exploit the deeper levels of cave systems is regarded as complex human behavior. Evidence that Neanderthals possessed this skill remains limited. The site of Escoural, in southern Portugal, is worldwide renowned for the Upper Paleolithic rock art that was performed in the lowermost level of the cave. The site also preserved Middle Paleolithic sequences in a deep chamber (P1) as well as in an area that today lies outside of the cave (P2). Due to the lack of geoarchaeological analyses, it is currently impossible to clarify whether these materials reflect systematic Neanderthal visits to these site areas. In this study we integrated geoarchaeological data and radiocarbon dating to (i) reconstruct site formation processes, and (ii) explore the interaction between Neanderthals and carnivores at Escoural. Micromorphological, stratigraphic, and geochronological results demonstrate that colluviation moved sediments and archaeological finds from upper cave chambers into P1. This process likely mixed separate and distinct assemblages, possibly leading to co-occurring high concentrations of carnivore coprolites and lithic artifacts. In contrast, P2 preserves in situ Neanderthal occupations alternating with carnivore visits. Neanderthal foragers used this area when it was a large chamber located close to the original cave entrance, which was subsequently lost due to roof collapses and likely impacted by modern quarrying activities. These findings align with broader Eurasian patterns indicating that Neanderthals primarily used well-lit karstic cavities rather than deep, enclosed spaces. Moreover, this study underscores that post-depositional processes may have profound impacts on our interpretation of Neanderthal and carnivore cave use.
- Stone tool shaping without direct cultural transmissionPublication . Ferar, Nolan; Moos, Elena T.; Karakostis, Fotios Alexandros; Snyder, William D.; Bolzmann, Maria; Haas, Michael; Kainz, Emanuela; Rau, Leonie; Sailer, Emil; Schönle, Jannik; Moore, Mark W.; Tennie, ClaudioWhile environment and biology play important roles, the complexity and variability of human life today depends in many ways on special cultural processes. Terminologies differ, but the key insight is that these processes are required to enable and to produce copies of behavior or artifacts that otherwise lie fully or partly beyond individual reach. Such “know-how copying” has proven rare in the animal kingdom, and is nearly or fully absent in contemporary apes, suggesting an evolution in hominins. It has been claimed that the earliest widely accepted instances of shaped stone artifacts – handaxes, which appear with the Acheulean (c. 1.9–1.6 Mya) – must have required know-how copying. The argument holds that the knowledge of how to shape (shaping know-how) handaxes is beyond individual reach in principle. If true, handaxes would be a valid marker for the presence of know-how copying. We tested this specific claim in two complementary studies using the “puppet method,” a new methodology that experimentally disentangles knapping know-how and shaping know-how. Knapping-naïve “puppeteers” were tasked with replicating target shapes by directing the flake removals of an expert “puppet” knapper, who was not shown the target shapes. As a validation of the puppet method, we first tested if knappingnaïve puppeteers could shape glass blanks into novel, non-archaeological shapes (Arbitrary Shape Study). Two types of analyses, a sorting task and geometric morphometric analyses, confirmed that they could. We then tested whether knapping-naïve puppeteers could replicate an Acheulean handaxe target shape in stone by directing the puppet knapper (Handaxe Study). Three expert lithic archaeologists independently classified the outcomes and confirmed that naïve participants successfully created handaxe shapes. Across both studies, our findings indicate that not all shaping know-how requires direct access to cultural models, and this also holds true for handaxe shaping per se. This conclusion aligns with recent calls for a reorientation in the search for the origins of knowhow copying in the hominin lineage.