Survey and excavation conducted by Stoner and Nichols (2019) at Altica, located in the Basin of Mexico, recovered nearly 29,000 pieces of obsidian, most of which apparently came from the nearby Otumba source. Formal classification followed by attribute analysis revealed a number of distinct lithic industries represented in the collection, although most are represented by finished objects that do not appear to have been produced on site. Most of the material consists of flakes probably used as unmodified, informal tools and produced on expedient cores consisting of some nodules but mostly percussion blades, spent cores, and other artifacts recycled as secondary cores. I propose that Altica acquired its obsidian from workshops possibly located in an area where they apparently existed in later times and may have during the Early–Middle Formative, as well. Virtually all of the obsidian in the collection appears to have been used for domestic or subsistence activities and was not involved in production or exchange systems believed to have existed at that time. Two unusual caches containing macronodules provide some evidence to the contrary, suggesting that Altica may have been a transshipment center.

中文翻译：

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ALTICA 的黑曜石产业及其在墨西哥中部早期至中期形成的黑曜石开采中的位置

Stoner 和 Nichols（2019 年）在位于墨西哥盆地的 Altica 进行的调查和挖掘发现了近 29,000 块黑曜石，其中大部分显然来自附近的 Otumba 产地。正式分类和属性分析揭示了该系列中代表的许多不同的石器工业，尽管大多数都由似乎不是现场生产的成品表示。大多数材料由薄片组成，可能用作未经修改的非正式工具，并在由一些结核组成的权宜核心上生产，但主要是冲击叶片、用过的核心和其他作为二次核心回收的人工制品。我建议 Altica 从可能位于后期明显存在并且可能在早中期形成期间存在的区域的作坊中获得了黑曜石，也是。几乎所有藏品中的黑曜石似乎都用于家庭或维持生计活动，并未参与当时认为存在的生产或交换系统。两个含有大结节的不寻常缓存提供了一些相反的证据，表明阿尔提卡可能是一个转运中心。