The view that the Châtelperronian is the acculturation of late Neandertals brought about by contact with nearby moderns assumes an age of ca. 40,000 years ago for the earliest Aurignacian. However, the cultural meaning of the dated samples is dubious, either because they were collected from palimpsests containing other archaeological components or because the definition of the associated artifact suites as Aurignacian is not warranted. Wherever sample context is archaeologically secure, the earliest occurrences of the Aurignacian date to no earlier than ca. 36,500 B.P. This is in accordance with the strati-graphic pattern demonstrating the precedence of the Châtelperronian and equivalent technocomplexes of central and eastern Europe, consistently dated by various methods to before ca. 38,000 B.P. Given the Neandertal authorship of the Châtelperronian, it must be concluded that Neandertals had already accomplished their own Middle-to-Upper Paleolithic transition when the first Aurignacian moderns arrived in Europe. Therefore, such a transition occurred simultaneously and independently among European Neandertals and sub-Saharan moderns, across biological boundaries and irrespective of geographical proximity. This suggests that its causes lie in the domain of social process, not in that of putative biological mutations that would have bestowed symbolism upon a lineage of “chosen people.”