Search

73-61176 is an early-stage bifacial overshot thinning flake discovered in situ at 411.455 masl with a finely faceted bifacial platform and distal termination that removed a square edge from an opposing tool margin. This debitage was found below the stratigraphic position of the three oldest radiocarbon ages, dating 15,310 to 15,100 cal BP [1].

73-626 is a stemmed projectile point discovered in pit feature A2 (PFA2), Area A at Cooper’s Ferry site in Idaho [1][2].

73-628 is a stemmed projectile point discovered in pit feature A2 (PFA2), Area A at Cooper’s Ferry site in Idaho [1][2].

73-4423 is a hammerstone discovered in pit feature A2 (PFA2), Area A at Cooper’s Ferry site in Idaho [1].

Homo ergaster, also known as the “working man” is an extinct species or subspecies of archaic humans that lived in Africa during the Early Pleistocene. The majority of Homo ergaster fossils have been discovered along the shores of Lake Turkana in Kenya including the holotype KNM-ER 992 and the famous Turkana Boy (KNM-WT 15000), which is a nearly complete skeleton [1][2]. Other African sites include the North African sites of Tighenif (formerly Ternifine and sometimes assigned to Homo mauritanicus) in Algeria and Thomas Quarries and Sidi Abderrahman in Morocco; the East African sites of Konso Gardula and Omo in Ethiopia, Olorgesaillie in Kenya, and Olduvai Gorge in Tanzania; and possibly Swartkrans in South Africa, although it is not universally accepted that Homo ergaster was present [3].