Prehistory[ edit ] In , a metatarsal from " Callao Man ", discovered in , was dated through uranium-series dating as being 67, years old. Fox, an anthropologist from the National Museum. These include the Homo sapiens , as distinguished from the mid-Pleistocene Homo erectus species. The " Tabon Man " fossils are considered to have come from a third group of inhabitants, who worked the cave between 22, and 20, BCE. An earlier cave level lies so far below the level containing cooking fire assemblages that it must represent Upper Pleistocene dates like 45 or 50 thousand years ago.