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Abstract:The basins of the Manzanares and Jarama rivers have been connected to human activity since the early Palaeolithic. At the boundary between these rivers the abundance of flint has given place to exploitation and mining activities even in historical times. In recent years, projects related to urban expansion in the southeast of Madrid have brought to light various Palaeolithic deposits associated with workshops and tool production. These sites do not have evidence of river pebbles of quartzite, quartz or sandstone in the immediate environment that could have been used as hammerstones, meaning that hammerstones in these raw materials had to be transported and introduced into the sites from large distances. Given this situation, attention was paid to flint elements that show clear signs of being used as hammerstones. The aim of this study is to test the effectiveness of flint as hammerstone, testing whether the use of this raw material is indifferent to other rock types or if you have limitations or advantages in this regard. An experimental protocol was developed, allowing to observe specific knapping behaviours and justifying them in the archaeological and technological context in which they are located. Keywords: flint hammerstone; open air sites; recycling; knapping; Middle Palaeolithic sites Resumen:Las cuencas del Manzanares y el Jarama, se han relacionado con actividad humana desde los inicios del Paleolítico. Nuestra área de estudio se encuentra situada en la Plataforma divisoria entre dichos ríos. El sílex, muy abundante en dicha área fue empleado por los distintos grupos humanos recurrentemente, incluso en tiempos históricos.En los últimos años, los distintos proyectos de ampliación urbana del sureste de la ciudad de Madrid han sacado a la luz diversos yacimientos asociados a talleres de producción de herramientas. El sílex juega un papel fundamental en esta área. En estos yacimientos no tenemos evidencias de cantos de río en cuarcita, cuarzo o arenisca en el entorno inmediato que sean susceptibles de ser empleados como percutores. No obstante, sí aparecen percutores en estas materias primas que son 2 Navarro et al. (2016) claramente aportados a los yacimientos desde mayores distancias. Dada esta situación, llaman especialmente la atención los elementos en sílex que presentan claras huellas de haber sido empleados en la percusión. La existencia de éste tipo de percutores nos puede mostrar dos concepciones distintas: por un lado, un uso inmediato de la materia prima más cercana y por otro el reciclaje de elementos previamente desechados o agotados. También es probable un doble uso de una misma herramienta, como es el caso de los bifaces y percutores. Journal of Lithic StudiesEl planteamiento principal, en este caso de estudio, era comprobar la eficacia del sílex como percutor. Por medio de la experimentación, podemos comprobar si el empleo de esta materia prima resulta indiferente con respecto a otros tipos de rocas o si presenta dificultades o ventajas en este sentido. Para alcanzar dicho objetiv...

Lithic artefacts are usually associated with the different knapping methods used in their production. Flakes exhibit metric and technological features representative of the flaking method used to detach them. However, lithic production is a dynamic process in which discrete methods can be blurred, and in which features can vary throughout the process. An intermediate knapping method between the discoid and Levallois is commonly referred to under an umbrella of terms (the present research uses the term hierarchical discoid), and is associated with a broad geographical and chronological distribution throughout the Early and Middle Palaeolithic. This intermediate knapping strategy exhibits features of both the discoid and Levallois knapping methods, raising the question of the extent to which flakes from the three knapping methods can be differentiated and, when one is mistaken for another, the direction of confusion. An experimental assemblage of flakes detached by means of the three methods was used along with an attribute analysis and machine learning models in an effort to identify the knapping methods employed. In general, our results were able to very effectively differentiate between the three knapping methods when a support vector machine with polynomial kernel was used. Our results also underscored the singularity of flakes detached by means of Levallois reduction sequences, which yielded outstanding identification values, and were rarely erroneously attributed to either of the other two knapping methods studied. Mistaking the products of the discoid and hierarchical discoid methods was the most common direction of confusion, although a good identification value was achieved for discoid flakes and an acceptable value for hierarchical discoid flakes. This shows the potential applicability of machine learning models in combination with attribute analysis for the identification of these knapping methods among flakes.