There is something to think about in that.
Without going outside Europe, we have, however, to reckon with at least two other types of very early head-form.
In one of the caves of Mentone known as La Grotte des Enfants two skeletons from a low stratum were of a primitive type, but unlike the Neanderthal, and have been thought to show affinities to the modern negro.

As, however, no other Proto-Negroes are indisputably forthcoming either from Europe or from any other part of the world, there is little at present to be made out about this interesting racial type.
In the layer immediately above the negroid remains, however, as well as in other caves at Mentone, were the bones of individuals of quite another order, one being positively a giant.

They are known as the Cro-Magnon race, after a group of them discovered in a rock shelter of that name on the banks of the Vezere.

These particular people can be shown to be Aurignacian--that is to say, to have lived just after the Mousterian men of the Neanderthal head-form.

If, however, as has been already suggested, the Galley Hill individual, who shows affinities to the Cro-Magnon type, really goes back to the drift-period, then we can believe that from very early times there co-existed in Europe at least two varieties; and these so distinct, that some authorities would trace the original divergence between them right back to the times before man and the apes had parted company, linking the Neanderthal race with the gorilla and the Cro-Magnon race with the orang.