Archeological findings 
Above all that, there were a series of Archaic period campfires, dated between 10,500 and 9,000 years ago. 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.
Levels were included in the Early and Middle Horizon occupations, cist tombs, and wall paintings between about the 1000 BCE–1000 CE.
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.
Some of the earliest cultivated plants in South America have been found in the cave. They include:
- Ají pepper (Capsicum baccatum): first appears at Guitarrero cave in 8,500 BCE
- Oca (Oxalis tuberosa): first appears 8,500–7,500 BCE
- Aji (Capsicum chinense): first appears 8,000–7,500 BCE
- Common bean (Phaseolus vulgaris): first appears 8,000–7,500 BCE
- Pallar bean (Phaseolus lunatus): first appears 8,000–7,5000 BCE
- Lúcuma (Lucuma bifera): first appears 8,000–5,500 BCE
- Olluco (Ullucus tuberosus): first appears 6,000 BCE at the cave Tres Ventanas in Chile and next at Guitarrero cave 5,500 BCE.
- Zapallo (Cucurbita sp.): first appears 7,000 BCE
- 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.
- Weber, George. "Guitarrero cave (Ancash, Peru)." Possible Relatives in the Americas. 11 July 2007 (retrieved 23 Feb 2010)
- Lynch, Thomas F.; Gillespie, R.; Gowlett, John A. J.; Hedges, R. E. M. (1985). "Chronology of Guitarrero Cave, Peru". Science 229 (4716): 864–7. doi:10.1126/science.229.4716.864. PMID 17777927.
- Stone-Miller, 17
- Stone-Miller, Rebecca. Art of the Andes: from Chavín to Inca. London: Thames and Hudson, 2002. ISBN 978-0-500-20363-7.