I’ve had several people comment on the unique skull shape of the Achavanich individual. It is hard to see in photographs what is being referred to so I have created an illustration to try and give you a better idea.
The arrows around the outline of the skull highlight areas of potential abnormality. If you look carefully at the arrows on the view from the back (in the bottom right hand corner) you will see the angles on each side are quite dis-similar.The side view (left) also shows the flat top and side has a particularly sharp change in angle. Compared to other skulls, this is quite distinct.
I hoped this helps to explain what we are referring to when we mention the irregularity, unique or abnormal shape of the skull.
I have created a second illustration, which shows the Achavanich individual (partial rough reconstruction shown in light blue) in comparison with a relatively normal/average skull shape (copied from isknonews.org). Hopefully this, again, helps to highlight the distinct shape of the back of the head (again highlighted by the arrows).
As always: comments, thoughts and ideas are warmly welcomed.