At Superior, the nodules are definitely eroding from perlite. No nodules were recorded embedded within perlite, but marekenites were recovered with perlite still attached. Some are 'on sale' that approach 8 cm. The density and nodule size recorded are probably skewed by the heavy collection that has occurred here in recent years.
Cortical material is primarily a thin whitish perlite, with black glass showing.
The glass is an excellent knapping material, second to none in the study area and equaled only by Vulture, Sauceda, and Antelope Wells. Reduction of the nodules is actually uncommon at the source. This may be due to common prehistoric knowledge concerning the consistent good quality. Many reduced nodules and Archaic projectile points were less than 5cm in diameter, suggesting that the nodule size found today may not be too different than during the Archaic period. Reynolds et al.