Archaeological Research Facility

The mix of sources is similar to the previous study (Shackley 2019a) with none of the sourcesto the west of the Sierra Madre ridgeline in Sonora (see Table 1 and Figure 1; Kibler et al. 2014; Shackley 2005). The TX UnknownA type is also present as well as Mount Taylorobsidian(Grants Ridge) the latter most likely procured from Rio Grande Quaternary alluvium, and two Chihuahuan sources(Lago Fredrico and Lago Barreal) the latter present in the previous study(Church 2000; Shackley 2012).See previous study for a more extensive discussion of sources and regional geology (Shackley 2019b).