Mammalian megafauna from Ethiopia's mid-Pliocene Hadar Formation is compared with those from sites in eastern and southern Africa. The presence of archaic taxa in the lower Hadar succession gives more support to an older (3.6 my) rather than younger (3.0 my) age for the KMB Basalt. Makapansgat is biochronologically younger than nearly all of the Hadar Formation. Chronological placement of the Australopithecus afarensis fossils from Hadar has no bearing on the validity of the species.
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White et al. (1984) studied this question.
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