There was no charcoal in the area to help keep the people there warm. The rainy season is between November and March. It was investigated by Richard S. MacNeish who is formerly of the University of Calgary. Pikimachay has evidence of a long sequence of human occupation. Radiocarbon dates show the presence of man to 20,000 years ago.
Later levels give evidence to burins, blades, fishtail points, manos, and metates.
The people of the time conformed to big game hunting followed by hunting and gathering. This site is thought to have the oldest remains of human occupation in South America. This site has revealed remains of humans and gigantic animals. Other animals whose bones were found in the layers of the cave include bones of sloths and horses. There were 79 artifacts - most look like rock off the wall.