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Table 2 Summary information for early hominin species (Ma = millions of years)

From: The First Hominins and the Origins of Bipedalism

Taxon Age range (Ma) Type Specimen Type Locality
Sahelanthropus tchadensis 6.8–7.2 TM 266-01-060-1 Toros-Menalla, Chad
Orrorin tugenensis 5.7–6.0 BAR 1000′00 Tugen Hills, Kenya
Ardipithecus kadabba 5.2–5.8 ALA-VP-2/10 Middle Awash, Ethiopia
Ardipithecus ramidus 4.4 ARA-VP-6/1 Aramis, Ethiopia