The archaeological evidence from the end of the Middle Holocene and the beginning of the Late Holocene (ca. 5000-2000 years BP) shows a period of great changes. These appear to be the main result of low residential mobility occupations and subsistence strategies based in the specialized hunting of camelids, their domestication and further herding. Even though there is no consensus over the relative importance of each adopted strategy (hunting vs. herding) during this temporal sequence, several and relevant changes can be observed, related to many social spheres. In this paper, we present the particular changes over lithic technology during the temporal sequence proposed through two sites analysed from Barrancas: Laguna Media 7 and Morro Blanco. First, we will clarify the concept of technical system and describe the operative chains observed in both sites. This context is suitable for the topic addressed in this paper, since the chronological difference between both sites (ca. 3400-3200 years BP) is almost contemporary with the appearance in the region of the domesticated camelid Lama glama. Thus, we explain the changes in lithic technology and their relation with the other raw materials used in different technologies from a qualitative characterization. Afterwards this change is characterized by performing separate Chi square analysis from the quantification between both sites of: transformative and prehensile techno-units, shaping and knapping methods. We detect some continuities related to the operative chains, but some changes as well, with the disappearance of blade knapping. Finally, we conclude that the changes during this time period are mainly related with the prehensile and hafting system, associated to a broader regional technological change, influenced by the circulation and exchange of goods, knowledge and people.

中文翻译：

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在巴兰卡斯（阿根廷胡胡伊省）的最终全新世中期和全新世晚期（约BP 5000-2000年）期间的技术变化

从中全新世末期到晚全新世（约公元前5000-2000年）的考古证据显示出一个巨大的变化时期。这些似乎是居民流动性低的职业和以骆驼科动物的专门狩猎，驯化和进一步放牧为基础的生存策略的主要结果。尽管在这个时间序列上，对于每种采用的策略（狩猎还是放牧）的相对重要性没有达成共识，但仍可以观察到与许多社会领域相关的一些相关变化。在本文中，我们介绍了通过从Barrancas分析的两个站点提出的时间序列中，石器技术的特殊变化：Laguna Media 7和Morro Blanco。第一，我们将阐明技术系统的概念，并描述在两个站点中观察到的操作链。这种情况适合本文中讨论的主题，因为两个地点之间的时间差异（约BP 3400-3200年）几乎是当代的，并且出现在驯养的骆驼科动物喇嘛地区。因此，我们从定性的角度解释了石器技术的变化及其与不同技术中使用的其他原材料的关系。此后，此变化的特征是通过对以下两个位置之间的定量进行独立的卡方分析：转化技术和prehensile技术单位，成型和敲打方法。我们检测到一些与操作链相关的连续性，但是随着刀片绑架的消失，也发生了一些变化。最后，