Aspects of this topic are discussed in the following places at Britannica.
...not only to members of the genus Australopithecus but also to other humanlike primates that lived in Africa between 6 and 1.2 mya. Other australopiths include Sahelanthropus tchadensis (7–6 mya), Orrorin tugenensis (6 mya), Ardipithecus kadabba and Ardipithecus ramidus (5.8–4.4 mya),...
in Australopithecus: Quality of the fossil record )...The first two-thirds of the fossil record comes almost entirely from sites in the East African Rift Valley and from limestone caves in South Africa. The exceptions are Sahelanthropus tchadensis and the jaw fragment from Baḥr el-Ghazāl in Chad, which call attention to the strong likelihood that other hominins lived throughout tropical and...
The earliest candidate for hominin status is Sahelanthropus tchadensis, based on a cranium from the country of Chad in north-central Africa. Announced in 2002, this specimen is dated to the period between 7 and 6 mya. The distinctive mark of Hominini is generally taken to be upright land locomotion on two legs (terrestrial bipedalism). The skull of S. tchadensis...
...Europe, where it lived from 13 to possibly 8 mya. Graecopithecus lived in northern and southern Greece about 9 mya, at roughly the same time as Samburupithecus in northern Kenya. Sahelanthropus inhabited Chad between 7 and 6 million years ago. Orrorin was from central Kenya 6 mya. Among these, the most likely ancestor of great apes and humans may be either...
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