Produce Stone Tools Research Articles

The use of chimpanzee-modified faunal assemblages to investigate early hominin carnivory.

Chimpanzees regularly hunt and consume prey smaller than themselves. It seems therefore likely that early hominins also consumed small vertebrate meat before they started using and producing stone tools. Research has focused on cut marks and large ungulates, but there is a small body of work that has investigated the range of bone modifications produced on small prey by chimpanzee mastication that, by analogy, can be used to identify carnivory in pre-stone tool hominins. Here, we review these works along with behavioral observations and other neo-taphonomic research. Despite some equifinality with bone modifications produced by baboons and the fact that prey species used in experiments seldom are similar to the natural prey of chimpanzees, we suggest that traces of chimpanzee mastication are sufficiently distinct from those of other predators that they can be used to investigate mastication of vertebrate prey by early hominins.

Петрография и геология палеолитических местонахождений Северного Приаралья и Мугоджар (Казахстан)

Use of quartzite rocks of the saksaul formation and its continental analogues as raw materials for the lithic industries called “siliceous”, “drain”, “quartzite” sandstones and siltstones, and “quartzites” in Western Kazakhstan has been known since the Middle Paleolithic up to the Early Iron Age. Their earliest use, in Acheulean, took place exactly in the Northern Aral Sea region and Mugodjary. The Paleolithic sites of the Northern Aral Sea region and Mugodjary are associated with the outcrops of quartzite sandstone of the Paleogene age due to the fact that this rock, in terms of its physical characteristics and shallow occurrence, and sometimes its outcrops to the surface, is the only possible source of raw materials for producing stone tools in the region. Despite the fact that the stone material of the Paleolithic location of the Northern Aral Sea and Mugodjary is rather monotonous within the items, it is still macroscopically different, and petrophysical differences become especially evident during weathering. Considering that the paleoclimatic conditions of the Aral Sea region and Mugodjary since the Cretaceous period were under the influence of Aeolian denudation with a constant predominance of westerly winds (due to the rotation of the Earth), the manifestation of this factor on artifacts, generally should be directly proportional to the time of its impact. It was found that deflations on artifacts were subjected both to the original, weathered cavernous surfaces, on which it is manifested by matting and polishing of detrital quartz grains, and its own chipped surfaces forming the artifact. However, it was established that very often, different degrees of deflation are manifested on the same artifact, and not only on the surfaces from different sides of the artifact, but sometimes within the same chipped surface. It means that the weathering degree, including the deflation degree, of quartz sandstone artifacts cannot be used for their chronological interpretation.

Raw material optimization and stone tool engineering in the Early Stone Age of Olduvai Gorge (Tanzania).

For more than 1.8 million years hominins at Olduvai Gorge were faced with a choice: whether to use lavas, quartzite or chert to produce stone tools. All are available locally and all are suitable for stone tool production. Using controlled cutting tests and fracture mechanics theory we examine raw material selection decisions throughout Olduvai's Early Stone Age. We quantify the force, work and material deformation required by each stone type when cutting, before using these data to compare edge sharpness and durability. Significant differences are identified, confirming performance to depend on raw material choice. When combined with artefact data, we demonstrate that Early Stone Age hominins optimized raw material choices based on functional performance characteristics. Doing so flexibly: choosing raw materials dependent on their sharpness and durability, alongside a tool's loading potential and anticipated use-life. In this way, we demonstrate that early lithic artefacts at Olduvai Gorge were engineered to be functionally optimized cutting tools.

Petrology and Provenance of Lithic Raw Materials used to knap stone: A Case Study From the Inner Ionian Sea

This paper examines the lithology and raw material provenance of knapped stone artifacts recovered from prehistoric sites on Meganisi in the course of the Inner Ionian Sea Archipelago survey. Research was twofold: in the field to map the geology of the island and collect raw material samples, and in the laboratory to conduct a petrological study using LM, XRD, SEM and ICP-MS techniques. The greater part of the materials used to produce stone tools consists of almost pure SiO2, bedded or nodular cherts mainly of Malm–Turonian and Eocene ages. The cherts were collected by prehistoric knappers from local sources. Patinas present on the artifacts are relatively enriched in calcite material of incomplete silica diagenesis and subsequently a product of late weathering and alteration.

Microflint in archaeological sediments from Boker Tachtit, Israel: A new method for quantifying concentrations of small flint fragments

Flint is one of the most common rock types used for producing stone tools. During flint knapping huge amounts of microscopic sized flint particles are produced. Thus the presence of high concentrations of microflint in a sedimentary layer, could be a good indication that flint was knapped at that location. We have developed and tested a method for quantification of microflint concentrations in sediments. The method involves concentrating the microflints in specific density fractions, and then counting a representative proportion of the flint fragments using a polarized light microscope. We show that the method successfully identifies a knapping layer in an Initial Upper Palaeolithic level at the site of Boker Tachtit, Israel. This level also contains macroscopic flint debitage, including refitted artifacts. Microflint quantification can aid in identifying knapping areas and be useful for better understanding site formation processes.

The chert from the Castelltallat Formation (south-central Pyrenees): archaeometric characterisation and archaeological implications

Chert from the limestones and marly limestones of Castelltallat Formation (Ebro Basin) was widely used throughout prehistoric times in north-eastern Iberia to produce stone tools due to its properties and accessibility. A rough estimate indicates that this rock—either as raw material or as lithic products—was distributed mainly to the north of the outcrops, over an area of 6000–8000 km2. However, other rocks in the area have similar characteristics which can lead to confusion in the interpretation of its prehistoric use and distribution. In order to establish useful archaeometric criteria for differentiating this chert from other similar, the Castelltallat chert is characterised in petrographic, mineralogical and geochemical terms. The chert nodules are found to be homogenous at the macroscopic and microscopic level, with a significant presence of bioclasts, thus indicating they might be formed in a freshwater lake environment by the early diagenetic replacement of carbonates in shallow waters. The mineralogical composition is homogeneously uniform and of a flint type, characterised by an almost exclusive predominance of quartz, without any opaline phases, and a variable proportion of moganite. The iron oxide content is very low, whereas its chemical composition is unusually high in uranium which correlates positively with carbonate content and negatively with silica. Archaeometrical parameters are provided to reach a proper identification of tools knapped with this chert. This way, chert from Castelltallat Formation turns out to be a valuable lithological marker to evaluate the range of mobility of the human groups who lived in the north-eastern Iberia and their contacts with neighbouring areas.

The Experimental Study of Palaeolithic Heat‐Treatment Technology: A Case from the Shuidonggou Rock Resources, North‐West China

The application of heat‐treatment technology on lithic raw materials is an important feature of early modern human behaviour. The evidence of heat‐treated stone artefacts discovered at Localities 2 and 12 of the Shuidonggou Late Palaeolithic site, North‐West China, provides an important example for studying this technology among ancient humans in Asia during the Late Palaeolithic. The mechanism and effects of heat treatment on raw materials and the role of this technology in producing stone tools were studied by means of a simulation experiment and related analytical methods. These facilitated an in‐depth analysis of the heat‐treatment activities of the Shuidonggou occupants and their implications for cognitive ability and survival strategies of human populations at that time.

Biomechanical strategies for accuracy and force generation during stone tool production

Multiple hominin species used and produced stone tools, and the archaeological record provides evidence that stone tool behaviors intensified among later members of the genus Homo. This intensification is widely thought to be the product of cognitive and anatomical adaptations that enabled later Homo taxa to produce stone tools more efficiently relative to earlier hominin species. This study builds upon recent investigations of the knapping motions of modern humans to test whether aspects of our upper limb anatomy contribute to accuracy and/or efficiency. Knapping kinematics were captured from eight experienced knappers using a Vicon motion capture system. Each subject produced a series of Oldowan bifacial choppers under two conditions: with normal wrist mobility and while wearing a brace that reduced wrist extension (∼30°–35°), simulating one aspect of the likely primitive hominin condition. Under normal conditions, subjects employed a variant of the proximal-to-distal joint sequence common to throwing activities: subjects initiated down-swing upper limb motion at the shoulder and proceeded distally, increasing peak linear and angular velocities from the shoulder to the elbow to the wrist. At the wrist, subjects utilized the ‘dart-thrower's arc,’ the most stable plane of radiocarpal motion, during which wrist extension is coupled with radial deviation and flexion with ulnar deviation. With an unrestrained wrist, subjects achieved significantly greater target accuracy, wrist angular velocities, and hand linear velocities compared with the braced condition. Additionally, the modern wrist's ability to reach high degrees of extension (≥28.5°) following strike may decrease risk of carpal and ligamentous damage caused by hyperextension. These results suggest that wrist extension in humans contributes significantly to stone tool-making performance.

Hand pressure distribution during Oldowan stone tool production

Modern humans possess a highly derived thumb that is robust and long relative to the other digits, with enhanced pollical musculature compared with extant apes. Researchers have hypothesized that this anatomy was initially selected for in early Homo in part to withstand high forces acting on the thumb during hard hammer percussion when producing stone tools. However, data are lacking on loads experienced during stone tool production and the distribution of these loads across the hand.Here we report the first quantitative data on manual normal forces (N) and pressures (kPa) acting on the hand during Oldowan stone tool production, captured at 200 Hz. Data were collected from six experienced subjects replicating Oldowan bifacial choppers. Our data do not support hypotheses asserting that the thumb experiences relatively high loads when making Oldowan stone tools. Peak normal force, pressure, impulse, and the pressure/time integral are significantly lower on the thumb than on digits 2 and/or digit 3 in every subject. Our findings call into question hypotheses linking modern human thumb robusticity specifically to load resistance during stone tool production.

Some Comments on Blade Technology and Eastern Clovis Lithic Reduction Strategies

Blade/bladelet technology has been described as a highly efficient manner by which to produce stone tools, both tool blanks and finished forms. It was practiced during the Upper Paleolithic and Mesolithic (or Epipaleolithic) over vast portions of Europe, Asia, and Africa and it has also been ascribed to the Paleoindian Period for both Pre-Clovis and Clovis assemblages. However, the authors believe that in North America blade technology was relatively rare when compared to Old World settings and almost absent in some areas such as northeastern North America. Eastern Clovis lithic reduction systems supported a high degree of mobility, extremely low population densities, and an adaptation to a highly variable and changing Allerød and Younger Dryas environment. At roughly the same time, Old World Upper Paleolithic and Epipaleolithic peoples used relatively structured and standardized blade/bladelet manufacturing systems that best suited higher population densities with lower levels of mobility. This paper examines the characteristics of these different lithic reduction strategies and outlies the benefits of the bifacial core and tool technologies employed by early Paleoindians.

Upper limb kinematics and the role of the wrist during stone tool production

Past studies have hypothesized that aspects of hominin upper limb morphology are linked to the ability to produce stone tools. However, we lack the data on upper limb motions needed to evaluate the biomechanical context of stone tool production. This study seeks to better understand the biomechanics of stone tool-making by investigating upper limb joint kinematics, focusing on the role of the wrist joint, during simple flake production. We test the hypotheses, based on studies of other upper limb activities (e.g., throwing), that upper limb movements will occur in a proximal-to-distal sequence, culminating in rapid wrist flexion just prior to strike. Data were captured from four amateur knappers during simple flake production using a VICON motion analysis system (50 Hz). Results show that subjects utilized a proximal-to-distal joint sequence and disassociated the shoulder joint from the elbow and wrist joints, suggesting a shared strategy employed in other contexts (e.g., throwing) to increase target accuracy. The knapping strategy included moving the wrist into peak extension (subject peak grand mean = 47.3 degrees) at the beginning of the downswing phase, which facilitated rapid wrist flexion and accelerated the hammerstone toward the nodule. This sequence resulted in the production of significantly more mechanical work, and therefore greater strike forces, than would otherwise be produced. Together these results represent a strategy for increasing knapping efficiency in Homo sapiens and point to aspects of skeletal anatomy that might be examined to assess potential knapping ability and efficiency in fossil hominin taxa.

What novice knappers have to learn to become expert stone toolmakers

The aim of this paper was to determine what technical gestures must be learned in order to produce stone tools. To identify these gestures, we compared the performance of expert knappers and complete novices. We hypothesised that the differences between novices and experts would indicate which technical gestures experts had learned to successfully produce stone tools. Participants were video recorded while attempting to produce a crude handaxe. The recordings were analysed according to ethological methods used to study animal and human behaviour. The knapping performance of each participant was segmented and scored into units in order to identify the technical gestures being used. The results showed considerable differences between experts and novices in three technical gestures: the type of percussion support, the position of the blank and the angle of blow. Therefore, these three technical gestures appear to be crucial in learning to knap stone at the level of bifacial stone toolmakers. By studying how modern knappers gradually master these three technical gestures we may begin to understand how stone knapping is acquired, how bifacial stone tools emerged and what cognitive challenges early handaxe makers had to face.

Towards an archaeology of pedagogy: learning, teaching and the generation of material culture traditions

In this article we seek to build on efforts to apply the insights of social learning theory to interpret patterns of continuity and change in the archaeological record. This literature suggests that stable and often highly arbitrary material culture traditions are likely to be founded on our biologically evolved capacity for imitation. However, it has recently been argued that the latter may be insufficient to explain the long-term maintenance of complex and difficult-to-master skills, such as those required to produce stone tools, pots, textiles and other cognitively opaque cultural forms. To ensure that these skills are accurately transferred to the next generation, adults must actively guide and control the learning activities of their children, a mode of transmission that can be labelled ‘pedagogy’. The importance of pedagogy has often been overlooked in the theoretical and empirical literature on craft learning, a fact that can probably be attributed to an unnecessarily narrow conception of teaching that equates it with explicit linguistic instruction. Using ethnographic data gathered from detailed case studies, we characterize pedagogy in the context of craft apprenticeships as involving the gradual scaffolding of skill in a novice through demonstration, intervention and collaboration. Although these processes cannot be directly observed in the archaeological record, they can sometimes be inferred through the detailed reconstruction of operational chains in past technologies. The evidence we present suggests that pedagogy has played an essential role in securing the faithful transmission of skills across generations, and should be regarded as the central mechanism through which long-term and stable material culture traditions are propagated and maintained.

Flint mining in prehistory recorded by in situ-produced cosmogenic 10Be.

The development of mining to acquire the best raw materials for producing stone tools represents a breakthrough in human technological and intellectual development. We present a new approach to studying the history of flint mining, using in situ-produced cosmogenic 10Be concentrations. We show that the raw material used to manufacture flint artifacts approximately 300,000 years old from Qesem Cave (Israel) was most likely surface-collected or obtained from shallow quarries, whereas artifacts of the same period from Tabun Cave (Israel) were made of flint originating from layers 2 or more meters deep, possibly mined or quarried by humans.