Lithic blades are long and narrow flakes produced from prepared cores which form part of different technological complexes all around the world. In South America, the production and use of blades has been reported in different settings which include early hunter-gatherer occupations of the Pleistocene-Holocene transition, as well as Middle and Late Holocene occupations. Until now, the only reference to blade technology in Brazil comes from the south and corresponds to Early Holocene hunter-gatherer assemblages. This paper presents a second record of lithic blades in Brazil, which includes one fragment and three refitted artifacts manufactured from fine-grained silicified sandstone recovered from a surface site (Picao), which is located in the Dourado Municipality, central Sao Paulo state. Analysis undertaken on the blades involved the collection of metric data, including longitudinal curvature, and the elaboration of diacritic schemes which consider the direction and order of the observed remnant scars for interpreting the chronological sequence of removals. Results indicate the production of ³70.5 mm-long, softly curved blades, with evidence of preparation of the point of impact prior to extraction from the core, as well as the presence of unidirectional, parallel scars related to blade production from a single striking platform. These reduction characteristics resemble those encountered in the nearest contexts of southern Brazil and northern Uruguay, although differences also exist. In spite of the lack of chronological data, this new record of blades in central Sao Paulo state calls for more research into the origins and dispersion of this technology in southeastern South America.

中文翻译：

---

巴西石器刀片的新记录：圣保罗州Picão网站

碎石片是由预制芯制成的细长薄片，这些芯构成了世界各地不同技术体系的一部分。在南美，据报道在不同的环境下生产和使用叶片，包括更新世-全新世过渡的早期猎人-采伐者职业，以及中新世晚期。到现在为止，巴西唯一的刀片技术参考来自南方，与早期全新世的猎人-采集者组合相对应。本文介绍了巴西的第二条石器叶片记录，其中包括一个碎片和三个由从位于圣保罗州中部多拉多市的地表（Picao）回收的细粒硅化砂岩制成的人工制品。在叶片上进行的分析涉及收集度量数据，包括纵向曲率，以及制定变音符号方案，该变音符号方案考虑了观察到的残余疤痕的方向和顺序，以解释清除的时间顺序。结果表明产生了³70.5毫米长的柔软弯曲的叶片，有证据表明在从岩心中拔出之前已经准备好了冲击点，并且单次敲击产生了与叶片产生有关的单向平行疤痕平台。这些减少特征类似于在巴西南部和乌拉圭北部最近的环境中遇到的特征，尽管也存在差异。尽管缺少按时间顺序排列的数据，