Of the many items that were traded throughout the Postclassic (A.D. 850/900–1350) Aztatlan network, obsidian was perhaps the most prevalent. In this study, large assemblages of obsidian from five Aztatlan centers on the coastal plain are discussed: San Felipe Aztatan, Chacalilla, Amapa, Coamiles, and Peñitas. In total, over 12,000 obsidian artifacts were analyzed macroscopically and through handheld portable X-ray fluorescence. The results of these analyses illustrate regional patterns of obsidian use that appear consistent across the coastal plain. Generally, only three obsidian sources were used with frequency. The most proximal source was utilized for generalized reduction and probably acquired directly, while more distant obsidians from the Jalisco highlands are commonly found in the form of prismatic blades. These trends in obsidian use indicate an increase in source diversity concurrent with the development of the Aztatlan trade networks despite the local availability of quality obsidians. Finally, synchronic patterns of source distribution further indicate that sources were unevenly distributed as certain individuals likely had greater access to imported blades. In conclusion, this large study provides a regional perspective of obsidian use in Western Mexico on the coastal plain and showcases the pervasiveness of the obsidian trade during the Postclassic.

在整个后古典时代（公元 850/900-1350 年）阿兹塔特兰网络中交易的许多物品中，黑曜石可能是最普遍的。在这项研究中，讨论了来自沿海平原五个 Aztatlan 中心的大型黑曜石组合：San Felipe Aztatan、Chacalilla、Amapa、Coamiles 和 Peñitas。总共有超过 12,000 件黑曜石文物通过手持便携式 X 射线荧光进行宏观分析。这些分析的结果说明了在整个沿海平原上似乎一致的黑曜石使用区域模式。一般来说，只有三个黑曜石源被频繁使用。最近的来源被用于普遍还原并且可能直接获得，而来自哈利斯科高地的更远的黑曜石通常以棱柱刀片的形式被发现。这些黑曜石使用趋势表明，尽管当地有优质黑曜石，但随着阿兹塔特兰贸易网络的发展，来源多样性也在增加。最后，来源分布的同步模式进一步表明，来源分布不均，因为某些人可能更容易获得进口刀片。总之，这项大型研究提供了墨西哥西部沿海平原上黑曜石使用的区域视角，并展示了后古典时期黑曜石贸易的普遍性。源分布的同步模式进一步表明，源分布不均，因为某些人可能更容易获得进口刀片。总之，这项大型研究提供了墨西哥西部沿海平原上黑曜石使用的区域视角，并展示了后古典时期黑曜石贸易的普遍性。源分布的同步模式进一步表明，源分布不均，因为某些人可能更容易获得进口刀片。总之，这项大型研究提供了墨西哥西部沿海平原上黑曜石使用的区域视角，并展示了后古典时期黑曜石贸易的普遍性。