In 2014, an anthropic accumulation of chert material was discovered in La Guinardera area, at the southwest of the Sant Martí de Tous town (Barcelona, NE Iberian Peninsula). In 2018 a first archaeological intervention was carried out in two locations: La Guinardera and La Guinardera Nord. After the fieldworks, these two accumulations were interpreted as chert workshops. These workshops are in the St. Genís Formation, included within La Noguera lacustrine system and dated to the Priabonian age (upper Eocene). The St. Martí de Tous area presents shallow lacustrine conditions typical of sabkha environments, in which layers of gypsums and sandy lutites are interspersed with tabular red sandstone levels, yielding different varieties of chert. The Guinardera chert is characterized by a fairly homogeneous matrix, presenting a fine texture, with a microcrystalline and spherulitic length-slow chalcedony matrix, and a combination of grey colours, in general of dark hues, with an opaque diaphaneity but translucent at the edges. The archaeological assemblage from La Guinardera Nord site allows us to identify a chert workshop for the production of gunflints. The heterogeneity of the assemblage at La Guinardera site precludes assigning it to any single chrono-cultural period or function. The technological characterization of La Guinardera Nord site reveals distinctive attributes of a gunflint workshop that can be differentiated from prehistoric workshops. The presence of square and thick preforms, oxide traces on butts and ventral faces, marked bulbs and thick platforms, together with fresh edges on flakes and blades and the near-absence of patinated materials, corroborate it. The presence of these two deposits within the above-mentioned formation shows us a repeated landscape exploitation pattern for raw material extraction, since references chert use range from the Middle Palaeolithic (e.g., Abric Romaní) to historical times (e.g., La Guinardera Nord).

中文翻译：

---

Guinardera 采石场（Sant Martí de Tous，巴塞罗那）：历史上一个新的燧石开采地点

2014 年，在 Sant Martí de Tous 镇（伊比利亚半岛东北部巴塞罗那）西南部的 La Guinardera 地区发现了人为的燧石材料堆积。2018 年，在两个地点进行了第一次考古干预：La Guinardera 和 La Guinardera Nord。实地考察后，这两个积累被解释为燧石工作坊。这些工作坊位于圣热尼斯组，包括在拉诺格拉湖系统中，可追溯到普里雅本纪（上始新世）。St. Martí de Tous 地区呈现典型的 sabkha 环境的浅湖条件，其中层层石膏和沙质鲁特石散布着板状红砂岩层，产生不同品种的燧石。Guinardera 燧石的特点是基质相当均匀，质地细腻，具有微晶和球晶长慢玉髓基质，以及灰色的组合，通常是深色调，具有不透明的透明度，但在边缘是半透明的。来自 La Guinardera Nord 遗址的考古组合使我们能够确定一个生产燧石的燧石车间。拉吉纳德拉遗址组合的异质性排除了将其分配给任何单一的时间文化时期或功能的可能性。La Guinardera Nord 遗址的技术特征揭示了火石作坊的独特属性，可以与史前作坊区分开来。方形和厚预制件的存在、枪托和腹面上的氧化物痕迹、标记的灯泡和厚平台，以及薄片和刀片上的新鲜边缘以及几乎没有锈蚀材料，都证实了这一点。