ICR2-Artigos (em revistas ou actas indexadas)
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Recent Submissions
- Reconstructing hammerstone size flake by flake: an experimental approachPublication . Li, Li; McPherron, ShannonUnderstanding force application in flake production is essential for reconstructing hominin behaviour, technological advancements and biomechanics. Extensive research has examined stone tool production, focusing on the intended material outcomes such as the cores, tools and flakes. Analyzing force application in this process requires knowledge of hammerstone selection and use. Despite progress made in understanding hammerstone selection and use, linking specific knapping outcomes to hammerstone use remains challenging. This difficulty stems from the complex relationship between fracture mechanics and material signatures in lithic artifacts. Key variables related to hammerstone use and their influence on flaking outcomes remain poorly understood. We draw on fracture mechanics to explore factors driving flake ring crack size-the circular region where the Hertzian cone, a feature of conchoidal flaking, intersects with the platform. Our experiment systematically examines how hammerstone size, velocity and strike angle-factors influencing strike force-affect ring crack and flake size under controlled conditions. We validate our findings with previously reported controlled and replicative experiments. Results show that flake ring crack size can estimate hammerstone size. Our findings mean that we can reconstruct the flaking process and particularly variability in the application of force at a level of detail previously unavailable.
- Engineering skills in the manufacture of tools by wild chimpanzeesPublication . Pascual-Garrido, Alejandra; Carvalho, Susana; Mjungu, Deus; Schulz-Kornas, Ellen; Casteren, Adam vanPhysical evidence of early hominin perishable tools is scarce. However, it is reasonable to assume the mechanical constraints surrounding tool use and manufacture have remained somewhat constant. Using a functional framework to understand the technical capabilities of extant hominoid tool users presents a novel approach to predict the perishable tool-using capabilities of our earliest relatives. We investigated the structural and mechanical properties of plant materials used by wild chimpanzees to make termite fishing probes. Materials sourced from plant species extensively used by chimpanzees produced implements of greater flexibility than those constructed from plants never selected by chimpanzees. This pattern was also reflected in chimpanzee tool species preferences, with preferred plant species producing highly flexible implements. Implement flexibility aligns with functional predictions and likely facilitates termite attachment. Our findings provide insights into the technical skills associated with perishable artefact-making and raise questions about how this knowledge is learnt and culturally transmitted.
- Flake production: a universal by-product of primate stone percussionPublication . Proffitt, Tomos; Medeiros, Paula de Sousa; Martins, Waldney Pereira; Luncz, Lydia. V.The evolution of stone tool technology marks a significant milestone in hominin devel-opment, enabling early humans to manipulate their environments. The oldest known evidence, dating to 3.3 Ma, indicates a combination of percussive and flake production activities. Studying the archaeological signature of percussive stone tool use in living primate provides a potential analog to the origin of stone flake technology in the hom-inin lineage. Here, we present a yellow- breasted capuchin (Sapajus xanthosternos) stone tool assemblage from Fazenda Matos, Brazil, to explore the variability of the material signatures associated with percussive tool use. Our analysis of this record demonstrates many archaeological features previously associated with intentional flake production. This includes hammerstones with substantial percussive damage and a range of flaked and detached pieces. Comparative analyses with other flaked primate and hominin assemblages reveals that, unintentional flake production is a universal component of stone hammer and anvil percussive behaviors, suggesting that similar behaviors by early hominins may have led to stone flake technology and that this record may have been highly variable. To fully understand the origins of hominin stone technology, a broad spectrum of material records including both hominin and primate must be considered.
- Scales of toolstone transport in the Armenian Highlands during MIS 3: The contribution of Ararat-1 Cave (Ararat Depression) to reconstructing opportunities for social interactionsPublication . Frahm, Ellery; Cabrita Nora, David André; Gasparyan, Boris; Petrosyan, Artur; Malinsky-Buller, ArielMarine Isotope Stage (MIS) 3, ranging from around 57,000 to 29,000 years ago, is a period of significant archaeological interest due to notable transitions in lithic technology and hominin populations. In Europe, this time saw the replacement of Middle Palaeolithic (MP) technologies associated with Neanderthals by Upper Palaeolithic (UP) technologies linked to anatomically modern humans (AMHs). This technological shift is conventionally attributed to a demographic turnover; however, the timing of this transition varied regionally. The presence of Neanderthals and AMHs in the Levant, western Europe, and elsewhere over extended periods complicates the narrative, suggesting asynchronous and regionally diverse associations of hominin species and lithic technologies. This study shifts the attention to potential technological and cultural transmissions among MP- and UP-making groups, emphasizing the roles of social and exchange networks. Recent data from the obsidian-rich Armenian Highlands enable us to consider the mobility and land use of these groups without the added complication of toolstone with different knapping qualities, so patterns more clearly reflect mobility patterns, land use strategies, and potential social connections of foraging groups. These results suggest that, while MP-making groups in MIS 3 had overlapping territories, the UP-making groups at Aghitu-3 had smaller movements on the landscape. In contrast, MIS 2 sites with UP lithic assemblages have resource territories that apparently overlapped much like those of the MIS 3 MP sites. The findings hint at the possibility that differing mobility and land use during MIS 3 might have contributed to the coexistence of distinct lithic technologies, potentially through social transmission rather than a direct replacement of hominin populations.
- New Insights on an Old Excavation: Re-visiting the Late Middle Palaeolithic Site of Far’ah II, North-western Negev, IsraelPublication . Goder-Goldberger, Mae; Gilead, Isaac; Horwitz, Liora Kolska; Sánchez-Romero, Laura; Paixão, EduardoRevisiting collections from old excavations with new research objectives and analytical tools brings them to life and integrates them into evolving models of human-landscape interactions. This paper examines hominin behaviour and adaptations at the late Middle Palaeolithic open air camp site Far'ah II, dated to similar to 49 ka by analyzing the spatial patterning of assemblages from the 1976-1978 excavation seasons. This was facilitated by the large area excavated and the fact that all lithics and most bones larger than 2.5 mm were recorded using three dimensional coordinates. Examining the refitted flint sequences highlights the use of variable technological systems, including the Levallois unidirectional convergent method. Use wear on the ground stone tools suggests they were used for knapping as well as food processing, and the faunal assemblage reflects a wide range of species that were consumed on-site. By combining lithic refitting studies and spatial mapping of artefact and bone distribution using GIS, we have dissected the occupation history and demonstrate that the living floor defined during the excavations actually consists of at least two different occupation events, that partially overlap in the central area of the site. This analysis demonstrates that Far'ah II was probably a favoured locality, revisited by Middle Palaeolithic hominins due to its proximity to a rich mosaic of habitats.
- The role of environmental changes in the development of the agricultural economy during pre-aksumite and aksumite culturesPublication . Mekonnen, Degsew Z.; Olivera, Hugo R.; Gomes, Ana; Mekonnen, DegsewThe northern highlands of Ethiopia and Eritrea (NHE) hosted the earliest agricultural and urban societies in sub-Saharan Africa: the Pre-Aksumite and Aksumite cultures. However, the role of environmental shifts in the transition from hunting-gathering to agriculture and state formation remains unclear. This study reviews 95 peer-reviewed articles on paleoenvironmental data from the NHE and adjacent regions (6000-1000 BP), integrating recent archaeobotanical and archaeological findings. We draw three main conclusions: (1) Paleoenvironmental conditions during this transition were highly variable, with differing tempos and magnitudes of change across the region. (2) The emergence of early agriculture and Pre-Aksumite societies in the NHE was not directly driven by environmental changes around 3500 BP. Instead, social dynamics and interactions among local human groups provided a more plausible explanation. (3) The NHE highlands experienced a shift towards higher humidity during early Aksumite period, specifically between 2500 and 2000 BP and 1500 and 1000 BP. This climatic shift likely enhanced agricultural productivity, facilitating food surpluses that underpinned the expansion of the Aksumite Kingdom. These results suggest that while early agriculture was culturally driven, later state development was more closely tied to environmental factors. To understand the interplay between environmental and socio-cultural factors in the NHE, we recommended interdisciplinary approach integrating, paleoenvironmental, archaeological, and archaeobotanical and genetic studies. This will enhance data resolution, mitigate geographical biases, and refine our understanding of complex societies in the Horn of Africa.
- Fire use during the last glacial maximum: evidence from the epigravettian at korman' 9, middle dniester valley, UkrainePublication . Murphree, William; Ferro‐Vázquez, Cruz; Kulakovska, Larissa; Usyk, Vitalii I.; Kononenko, Olesia; Bosch, Marjolein D.; Haesaerts, Paul; Damblon, Freddy; Pirson, Stéphane; Nigst, Philip R.; Aldeias, VeraThe Last Glacial maximum (LGM), spanning from 26.5 to 19 thousand years before present (ka bp), is a period of extreme climatic degradation associated with reduced biomass production and resource stress throughout Eurasia. Arguably, one of the most fundamental tools for human survival during this cold and arid period was the ability to create, maintain and use fire. While fire is widely considered a ubiquitous tool in modern human behaviour, there are surprisingly few well-described combustion features during the LGM in Europe. In this paper, we provide high-resolution geoarchaeological research into three combustion features associated with Epigravettian occupations at the site of Korman' 9 (Ukraine) with ages falling in the LGM. Our results show distinct variations in the size and structure of the combustion features, potentially indicating multiple occupations within the same layer or reflect differences in site organization or function during a single occupation. Additionally, our analysis shows clear evidence of the effect of solifluction and the lack of preservation of the ash layer(s) of the combustion features, as well as the development of bioturbation features enhanced by anthropogenic input. To better estimate heating temperatures of the combustion events, we employed a novel approach using colour analysis showing temperatures reaching 600 degrees C in the substrate underlying the combustion features. In all, the combustion features at Korman' 9 provide invaluable new insights as well as high resolution description of pyrotechnological behaviours during the LGM, which has been lacking during this critical period in our evolutionary history.
- New upper palaeolithic rock art complex in the Tejo Valley, Central PortugalPublication . Pereira, Telmo; Garcês, Sara; Danelatos, Dionysios; Giraldo, Hipólito Collado; Nash, George H.; Adewumi, Opeyemi L.; Gomes, Hugo; Monteiro, Patrícia; Oosterbeek, LuizThis short report presents newly discovered Palaeolithic rock art panels within the Ocreza Valley (Lower Tejo River), central Portugal, comprising several engraved zoomorphic figures, including auroch and horse. Together, they substantially increase upon the previous headless horse found in 2000, and the style of the engravings is identical to Upper Palaeolithic open-air engravings from other areas of western Iberia, including the C & ocirc;a, Sabor, Tua, Siega Verde, La Salud, Z & ecirc;zere valleys, and Vale Boi. Currently, no clear deposits with Upper Palaeolithic artefacts have been identified over and next to the newly discovered rock. However, these discoveries indicate the occupation of Ocreza Valley during the Upper Palaeolithic and a possible concentration of Upper Palaeolithic rock art in this area of the Tejo Valley, yet to be established. If confirmed by future fieldwork, such Palaeolithic rock art may be overlapping the territory of an already-known Holocene-dated Tejo Rock Art Complex.
- Revisiting the thermal alteration of buried bonePublication . Gallo, Giulia; Aldeias, Vera; Stahlschmidt, MareikeThe impacts of heat exposure directly on bone material are widely acknowledged, yet a comprehensive understanding regarding the degree of thermal alteration experienced by bone buried beneath a combustion feature or fire event remains poorly described. Such potential incidental burning below a surface fire presents challenges for distinguishing between the intentional remains of fire use behaviors from haphazard heat exposure. In this study, we address the extent to which buried bone material can undergo alteration under concentrated high-heat conditions, achieved through using a fire simulator operating at 950 degrees C for a duration of 6 h simulating a high temperature hearth fire. Here we describe the degree of carbonization and calcination in bone samples buried at three depths (-2,-6, and-10 cm) in gravel and a mixed gravel and fine sand substrate. We find that, at the sustained temperature of 950 degrees C, plus heating and cooling time, calcination of bone material can occur at shallow depths of-2 cm under the fire simulator, whereas at-6 cm only one sample of each experimental condition is recognized to be fully structurally and chemically calcined. Despite only two samples calcining at this depth, several other bones buried at-6 cm displayed pale and light coloration, experiencing the elimination of organics without undergoing true calcination, likely due to the prolonged exposure to heat removing the organic component. At-10 cm depth, bone material centered under the heat source became carbonized, while buried bones positioned at the periphery of the heat source are recognized only be partially thermally altered. Notably, neither gravel nor a mixture of gravel and sand substrates create a detectable reduction environment in the spectroscopic analyses of the buried bones. Our findings highlight that not only can post-depositional heating significantly impact buried faunal material, but that in this way humans can act as post-depositional agents.
- Quantifying levallois: a 3D geometric morphometric approach to nubian technologyPublication . Hallinan, Emily; Cascalheira, JoãoLevallois technology, a hallmark of Middle Palaeolithic stone tool manufacture, involves sophisticated core reduction strategies that have major implications for understanding human cognitive and technological evolution. However, traditional methods of analysing Levallois cores often fail to capture the nuanced variability in their morphology. This study introduces a novel application of three-dimensional geometric morphometrics (GM) to quantify the shape variability of Nubian Levallois cores from the Nile Valley and Dhofar regions. By employing this technique, we analysed core surfaces and preferential scar shapes, identifying distinct regional and technological patterns. Our results reveal significant inter-regional differences in core elongation and surface convexity, highlighting the importance of shape-oriented, rather than metric-based, analysis of prepared cores. This new GM approach offers a robust and replicable tool for investigating lithic variability and holds potential for broader applications in Palaeolithic research, enhancing our understanding of human technological adaptations.