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首页> 外文期刊>Quaternary Research: An Interdisciplinary Journal >Palaeoenvironmental forcing during the Middle-Upper Palaeolithic transition in central-western Portugal
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Palaeoenvironmental forcing during the Middle-Upper Palaeolithic transition in central-western Portugal

机译：葡萄牙中西部中上古旧石器时代过渡时期的古环境强迫

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摘要

Geoarchaeological analysis of the Middle and Upper Palaeolithic record preserved in cave, rock-shelter and open-air sites in the northern sector of the Meso-Cenozoic of the Western Iberian Peninsula margin (Portugal) reveals several disconformities (erosive unconformities), hiatuses and surface stabilization phases. A recurrent disconformity, dated to ca. 29,500-32,000. cal. yr BP, in the time range of Heinrich event 3, must correspond to a main erosive event related to the impacts of climate change on the landscape, including a reduction in vegetation cover and altered precipitation patterns, with the consequent accelerated down-cutting by stream systems, slope reactivation and endokarstic reorganisation, causing the erosion of sediments and soils accumulated in cave, rock-shelter and open-air sites. These processes create a preservation bias that may explain why Early Upper Palaeolithic finds in primary deposition context remains exceptional in the carbonate areas of central-western Portugal, and possibly elsewhere in the other places of Iberia. The impact of such site formation processes must therefore be duly considered in interpretations of the current patchy and scarce archaeological record of the Middle-Upper Palaeolithic transition in south-western Iberia.
机译：对西伊比利亚半岛边缘（葡萄牙）中新生代北部北部洞穴，岩石收容所和露天场所保存的中，上古旧石器时代记录的地质考古学分析显示出一些不整合面（侵蚀性不整合面），裂隙和表面稳定阶段。复发性不一致性，可追溯至约29,500-32,000。校准yr，在Heinrich事件3的时间范围内，必须与与气候变化对景观的影响有关的主要侵蚀事件相对应，包括减少植被覆盖和改变降雨模式，从而导致溪流加速下坡系统，边坡活化和岩溶内重组，导致堆积在洞穴，避难所和露天场所的沉积物和土壤受到侵蚀。这些过程产生了一种保存偏见，这可以解释为什么在葡萄牙中西部的碳酸盐地区以及伊比利亚其他地方的早期沉积中，早期上古石器时代在原始沉积背景下发现的情况仍然例外。因此，在解释伊比利亚西南部中上古旧石器时代过渡的当前不完整和稀少的考古记录时，必须适当考虑这种遗址形成过程的影响。

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