Lambityeco represents an area of occupation within the Yeguih archaeological zone that is datable entirely to the Early Post-Classic, or period IV (750-950 C.E.) Lambityeco was evidently one of a number of smaller urban centers that arose in the Valley of Oaxaca during the decline of Monte Alban. Lambityeco was an important center of craft production and was involved in the extraction of salt and the manufacture of pottery. Lambityeco is also important as it is the site that best defines that material culture of the Early Post-Classic in the Valley of Oaxaca.
Despite the extensive investigations (excavation and intensive survey) carried out a Lambityeco, only three specimens of obsidian, all prismatic blades from a period IV tomb, were obtained from this important site. Sadly, all of the collections of obsidian from these investigations have evidently been lost.
-Archaeometry of Pre-Columbian Sites and Artifacts: Proceedings of a Symposium Organized by the UCLA Institute of Archaeology and the Getty Conservation Institute, Los Angeles, California, March 23-27, 1992.