The best estimate of the burial age of EYJR 2 is an age range that encompasses the uncertainty in the model EU-ESR ages of EYJR 2: 88–132 ka. We use this estimate to infer the age of the associated finds, including EH06.This ties in well with the idea of persistence of archaic features within African populations long after the appearance of more modern features, with the fully modern Omo coming before Homo sapiens idaltu from Herto, with its mix of archaic and modern traits, coming before more archaic EH06 from Lake Eyasi.
If the latter possibility is correct, EH06 shows an interesting continuation of the primitive features shown in Eyasi 1, in a period for which other areas have yielded, from a morphological standpoint, substantially more modern-looking specimens.
These modern-looking features are defined in broadly contemporary hominids by the expansion of the frontal area of the skull, with a more elevated and rounder slope of the frontal bone, together with a reduction of the supraorbital torus, supratoral area, and postorbital constriction. These are some of the features that morphologically differentiate Homo sapiens from earlier hominids. These features can be observed on the Omo and Herto crania (Ethiopia) and the Ngaloba (Tanzania), Jebel Irhoud (Morocco) and Florisbad (South Africa) crania, dated between 265,000 and 120,000 years ago ([Wolpoff, 1999], [White et al., 2003] and [McDougall et al., 2005]).
Journal of Human Evolution doi:10.1016/j.jhevol.2008.02.002
A new archaic Homo sapiens fossil from Lake Eyasi, Tanzania
M. Domínguez-Rodrigo et al.