This is, as noted earlier, perhaps the best known contemporary obsidian source in Arizona. Even after years of modern and prehistoric collection, nodules up to 15 cm in diameter are common. Most nodules exhibit little cortex, per se, but some are covered with ash from the alluvium or exhibit a thin gray or brown weathered surface. Some lighter gray and more vitreous material was recovered on the south slope.
Thin flakes are cloudy gray when viewed with transmitted light.
Wolfe et al. No other artifactual material was observed. Geologic map of the central part of the San Francisco Volcanic Field, north-central Arizona. USGS Miscellaneous Field Studies Map MF-1959. Sitgreaves Mountain .