 However, to date researchers could not agree on which of the several possible layers that belong to the Cromer-warm period is identical with the layer of the Grafenrain mine.So it happens that the commune of Mauer dates the fossil to an age "of more than 600,000 years" on its website, whereas the memorial stone called an age of 500,000 years.A range from 474,000 to 621,000 years is currently considered to be the established age of "layer 4", in which the actual fossil either originates from the lower (around 600,000) or the upper (around 500,000) spectrum.