Atapuerca researchers Aida Gómez and María Martinón have declared to Spanish newspaper Público that the material evidence from fossils clearly tell of a divergence time of c. 1 Ma., what strongly contradicts the short chronology proposed in a section of Green 2010 (but itself contradicted in the paper by another estimate of 850 Ka, more realistic).
Martinón says that the [proto-]Neanderthals who lived some 600,000 years at Atapuerca were already a different species from Homo sapiens. This makes impossible that their last common ancestor lived only 300,000 years ago, as the Neanderthal Genome project proposes. The teeth of other homins from the Gran Dolina of Atapuerca, from 900,000 years ago, already presented traits making them more Neanderthal than Sapiens, adds Gómez.
Reference research: Aida Gómez Robles et al., Geometric morphometric analysis of the crown morphology of the lower first premolar of hominins, with special attention to Pleistocene Homo. Journal of Human Evolution 2008. Pay per view.