Guitarrero Cave has evidence of human use around 8,000 BCE and possibly as early as 10,560 BCE. A human's mandible and teeth found in the cave have been carbon dated to 10,610 BCE.
Above all that, there were a series of Archaic period campfires, dated between 8,500 and 7,000 BCE. Wood, bone, antler and fiber cordage were among the artifacts that were recovered from the level, as well as willow leaf, tanged, lanceolate, and concave base Ichuna/Arcata projectile points. A single grinding slab and a bone flesher were also recovered from this part of the area.
In the 1960s, archeologists discovered artifacts in an extraordinary state of preservation at the site. Remarkably, textiles, wood and leather tools, and basketry have been preserved intact. Some of the evidence of early domesticated beans Phaseolus, chili, corn and other cultivars have been argued for Guitarrero.
Fiberwork found in the cave dates back over ten-thousand years – the earliest found in South America. The cave held utilitarian containers made by twisting, looping, and knotting plant fibers.
Maize or corn (Zea mays): possibly first traces but not conclusively identified from 6,200 BCE. Maize has been identified in the Ayacucho Region of south central Peru as early as 4,400 and 3,100 BCE.