A rock shelter in Pennsylvania with a long series of stratified deposits spanning the period from at least 14,000 BC up to the 18th century AD - Palaeoindian, Archaic, Late prehistoric, and historic periods. The site was occupied intermittently by groups representing all the major cultural stages in northeastern North America. Charcoal samples in the lowest stratum have yielded dates in the range 35,000-19,500 BC, although there was no association with cultural material. Flint tools bear a resemblance to finds at Blackwater Draw and Lindenmeier. The evidence from Meadowcroft established beyond reasonable doubt the presence of a human population south of the ice masses in the Late Pleistocene. Meadowcroft provides some of the earliest reliable evidence of man in North America.