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OH 6 was recovered from Bed I of FLK I in Olduvai Gorge. It is comprised of a mandibular third premolar, right maxillary first molar, right maxillary second incisor, and six calvaria fragments from a 5-6 year old Homo habilis child [1][2]. It is one of the hominin remains found in FLK Level 22 [2], which is bracketed by two volcanic tufts, both dated to approximately 1.84 Ma [3][4][5][6]. 

OH 5 is a cranium discovered by Mary Leakey in FLK I, Olduvai Gorge in 1959. It serves as the holotype for Paranthropus boisei and is also commonly known as ‘Zinjanthropus’, a genus name previously assigned to it by Leakey [1][2].

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].

Olduvai Gorge is one of the most important paleoanthropological localities in the world. It is located in the eastern Serengeti Plain, within the Ngorongoro Conservation Area in northern Tanzania. The many sites exposed by the gorge have proven invaluable in furthering our understanding of early human evolution [1][2]. One of the most notable sites in Olduvai Gorge is the FLK 1 site, where the OH 5, the holotype of Paranthropus boisei was discovered by Mary Leakey in 1959 [3].  When discovered, the site was considered one of the first sites in which the co-occurrence of lithics and bone remains appeared functionally linked [4]. It was and still is, the largest excavation of an anthropogenic site belonging to the Early Pleistocene [5].