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KNM-ER 1804 is a mandible fragment attributed to Paranthropus boisei. It was recovered from Area 104 of Koobi Fora. The specimen was stratigraphically located at 4m below the A2 marker and is dated to ~1.78 Ma [1][2][3].

KNM-ER 810 A is a left mandible fragment with symphysis classified as that of a Paranthropus boisei. It was found in Area 104 of Koobi Fora [1][2]. It was stratigraphically located 4m below the A2 marker in KBS member and is dated to ~1.78 Ma [3][4].

KNM-ER 810B is a lower left third molar classified as that of a Paranthropus boisei. It was found in Area 104 of Koobi Fora [1][2]. It was stratigraphically located 4m below the A2 marker in KBS member and is dated to ~1.78 Ma [3][4].

KNM-ER 812 is a mandible fragment attributed to a juvenile Paranthropus boisei. The heavily eroded fragment retains some parts of the retained roots of the deciduous canine and first and second deciduous molars remain preserved occlusally, all the crowns of these teeth have been lost [1][2].  It has a stratigraphical position of 4m beneath the base of A2 in Area 104 of Koobi Fora and is dated to ~1.78 Ma [3].

KNM-ER 814A is a left frontal fragment of the cranium of a Paranthropus boisei. It was found in Area 104 of Koobi Fora [1][2]. It was stratigraphically located 4m below the A2 marker in KBS member and is dated to ~1.78 Ma [3][4]. 

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].

Area 104 collection area in the Koobi Fora region has contributed great evidence for hominin evolution by providing fossil evidence from various taxa such as Homo ergaster and  Paranthropus boisei [1][2].