[8] Coprolite analysis at varying ages revealed that these occupants were omnivorous, eating a combination of foraged plants, seeds, small mammals such as rodents, fish, and insects like beetles.

[9] Other authors have questioned the authenticity and relevance of the evidence gathered from ancient DNA and stratigraphy[10] and challenge the morphological assignment of the coprolites to humans.

However, the Paisley Caves and other archaeological sites throughout the Americas, such as Monte Verde, have been dated to earlier than Clovis technologies.

[16] Recent research has called the accuracy of radiocarbon dates from these coprolites into question on the basis of morphology and possible leaching contamination by exogenous human DNA.

Other inter-mixed coprolites contained no human DNA, instead being fully attributed to late Pleistocene camelids and lions, and dated to 12,265 radiocarbon years.

Such lipids are chemically stable and hydrophobic, protecting them from water-induced mobility and serving as more reliable data from buried coprolites than DNA.

The Western Stemmed Tradition occupies similar tool groupings as Clovis technology—projectile points, most notably—and shares morphology and technology with Afro-Eurasian forms.

Evidence of repeated sharpening along Western Stemmed Tradition points suggests they may have also been used as knives for skinning and cutting.