Los trabajos geoarqueológicos realizados en el NE de España se han centrado en el estudio de registros sedimentarios holocenos relacionados con áreas de ocupación que abarcan desde el Neolítico hasta Época Medieval y la Pequeña Edad del Hielo. El dinamismo de los procesos geomorfológicos en estos ambientes semiáridos permite obtener respuestas rápidas e identificables en forma de registros sedimentarios como consecuencia de pequeños cambios en la estabilidad de las laderas y en el funcionamiento de los sistemas fluviales. En este trabajo se sintetiza la información aportada por el análisis de laderas, abrigos rocosos, fondos de valle y conos aluviales. Se ha obtenido una sucesión de etapas evolutivas en cada uno de estos ambientes a partir de los cuales se intenta discriminar su génesis en relación con las fluctuaciones climáticas del Holoceno y con la intervención humana sobre el territorio. Los resultados de estos trabajos son de gran interés aplicado para la prospección arqueológica, para el conocimiento del poblamiento en épocas pasadas y para la reconstrucción paleoambiental en el NE de España, donde la fuerte erosión ha dificultado la conservación de numerosos yacimientos.

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The study of human-driven processes is useful to gain a better understanding of the long-term evolution of land degradation, soil erosion, and geomorphology as well as resource availability for human settlement. The objective of this paper is to identify the long-term results of human impact on the vulnerable dryland ecosystems in Northwest Argentina, specifically to analyze the consequences of the spread and consolidation of the agricultural way of life on the landscape. To reach this objective, a multiproxy interdisciplinary geoarchaeological study was conducted to link an evolutionary geomorphological model with the soil development and degradation, peopling, and land use change during the Upper Holocene and integrate distinct areas of the Tafí Valley region, which is the most studied area, other neighbouring valleys, and the Puna. The analyses identified positive human-driven impacts that led to a general degradation of the landscape during the agricultural Prehispanic Period, dated between ca. 2000 and 500 BP. This degradation is manifested by accelerated morphogenesis, mainly fine-grained accumulated sediments, thick deposits, and the presence of human debris interbedded with the natural sediments. The success of the productive agricultural systems that expanded during the Formative Period led to a gradual increase in the demographic density, resulting in extensive environmental degradation due to overexploitation of the drylands of Northwest Argentina, in some cases increased by adverse climatic changes.

Resumen: Se analizan las acumulaciones holocenas de época histórica en el sur de la isla de Eubea. Los objetivos del trabajo se centran en la datación de los depósitos que rellenan los valles y se extienden por las llanuras litorales de este sector de Grecia oriental. Igualmente, se establece la génesis de los procesos, resultantes de la actuación humana sobre las laderas entre la epoca clásica griega y romana, en unas condiciones ambientales favorables a la degradación del medio. Los resultados se ponen en relación con otras áreas de Grecia y del Mediterráneo y se discuten las diferentes interpretaciones.Palabras clave: Geoarqueología, Grecia, Holoceno, Yo~~ngerfill.Abstract: The Holocene accumulations of historical age in the south of Eubea Island are analyzed in this work. The aims of the article are centred in the dating of the deposits that infill the valleys and are axtended over the litoral palins of this eastern Greece sector. We establish as well the genesis of processes, resulting of the human activity developed on the taluses between Greek and Roman classical ages, in environmental conditions which favour degradation of the landscape. The results are relationed with other greek and mediterranean areas, and the different interpretations are discussed.

En un valle de fondo plano ("val") del sector central de la depresión del Ebro se han estudiado las acumulaciones holocenas, estableciéndose un modelo de evolución partiendo de las dataciones efectuadas mediante c-14 y restos arqueológicos. Los resultados obtenidos muestran la existencia de dos etapas acumulativas, una iniciada en el neolítico y otra a principios de la época ibérica, así como una fase de incisión a lo largo de los últimos 1500 años.

The most important stratified screes of the Iberian Range are found in Sierra de Albarracín. These slope deposits have been traditionally considered, without absolute datings, as having been formed during various Pleistocene cold phases. The aim of this paper is to establish the sedimentological, morphological, chronological, and paleoenvironmental characteristics of these deposits through the study of four profiles recorded in the Calomarde canyon (El Rollo, El Molino, and Royuela) and Toril. The most representative profile is that of El Rollo as it is formed by basal tufa and stratified scree layers separated by paleosoils. Radiocarbon datings obtained from paleosoil samples show that the sequence ranges between the early and middle Holocene. The profiles from El Molino and Royuela, as well as the upper levels of Toril, complete the sequence showing deposits from upper Holocene (Bronze Age and 'Little Ice Age'). These data show the oscillations during the Holocene between colder phases, represented by the stratified screes, and warmer-wetter phases with soil development and local tufa deposits. This geomorphological and pedological response to the Holocene climatic variability shows its clearest records in the canyons. However, there are almost no Pleistocene accumulations -with the exception of that of Toril (minimum age of <43.5 ka BP). The possibility of relating this succession of Holocene environmental changes to known regional and global climatic stages converts these accumulations into the most important Holocene paleoenvironmental record from the Iberian Ranges and the most complete sequence of Holocene stratified screes from the Mediterranean area.

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Tafí valley is an elongated tectonic basin of about 450 km 2 located in NW Argentina in a mountainous frame of metamorphic and granitic Precambrian-Paleozoic rocks belonging to Sierras Pampeanas. This study presents the first detailed geomorphological map of the area. The most representative landforms date to the Lateglacial-Holocene, with four differentiating aggradative units separated by incision phases. Among these phases, it is possible to identify the units H1 (Lateglacial-Early and Middle Holocene) and H2 (Upper Holocene until ca. 600 cal BP). These units are composed of slopes, fluvial terraces, and alluvial fans, forming a coupled system. In some areas, this system is complemented with fluvioglacial and glacial landforms. More recent units (H3 and H4), together with active processes, contribute to the great variety of morphologies represented in the area.