The geology here is very similar to other mid-Tertiary sources in the region, especially Sauceda. Surrounding the silicic volcanics is an alluvium that contains chunks of rhyolite and basalt as well as marekenites up to 10 cm in diameter. The nodules are found at least 20 km south and east into the Hassayampa Plain and perhaps into the Gila River system. The nodules exhibit velvet-like to water eroded thin black cortex. The aphyric glass ranges from a nearly opaque brown-green to nearly transparent.
Some nodules are banded or cloudy, and one specimen was evenly banded with greenish and black bands.
The nodules are an excellent medium for small biface production. Here, as at all the marekenite sources, sporadic occurrences of bipolar reduction stations are common. The presence of cores and debitage is also sporadic, probably corresponding to the prehistoric location of nodules. These bipolar reduction areas may be 5 to 50 meters apart. This suggests that the nodules were 'test knapped' and those found suitable were removed.