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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].