The analysis here of 19 obsidian artifacts from 48PA3604 in Wyoming is dominated by Obsidian Cliff, Yellowstone Volcanic Field obsidian as in previous projects in the region, with two artifacts produced from the Malad, Idaho source (see cover image and Table 1 and Figure 1).  One artifact is produced from an, as yet, unlocated source that was not in the Skinner/Shackley North American obsidian source database.

The analysis here of an early Spanish crossbow bolt from central New Mexico (see cover image) indicates a dominantly iron (Fe) composition, not unlike the composition of others in the region. Data from the composition of a similar bolt from the Sevilleta Pueblo and Mission (LA 774) in the same area is included for comparison.

Two of the artifacts are produced from Valles Rhyolite (Cerro del Medio) obsidian, and one was not obsidian (Table 1). Valles Rhyolite (Cerro del Medio) has not been recorded in any size or quantity in the alluvium, including Rio Grande southern New Mexico localities, so was likely originally procured in Valles Caldera proper (Church 2000; Shackley 2005, 2012).