Archaeological Research Facility

The analysis here of 61 obsidian artifacts from sites along the Rio Santa Maria in central Chihuahua indicates a mix of sources from the secondary deposits along the Rio Santa Maria, the coalesced domes at Sierra Fresnal, and the Agua Fria/Sierra la Brena source along the Sonora/Chihuahua border in the northern Sierra Madre Occidental (see Shackley 2005; Figure 1 here). A number of, as yet, unlocated sources were also in the assemblage, but are likely from somewhere in northwest Mexico.