Pikimachay cave and Richard MacNeish’s early Andean dates

Record summary

Pikimachay Cave was excavated during the Ayacucho Valley project directed by Richard MacNeish, with reports proposing very early human occupation and a Pacaicasa cultural complex. The site became a major reference point in arguments about the timing of settlement in the Andes and the relationship between cave deposits, faunal remains, and early stone tools. Its comparative value lies in testing how early migration claims were constructed from stratigraphy and typology. Later researchers questioned whether the earliest layers contained unequivocal human artifacts rather than naturally fractured stone.