This shape is called a Rocker Jaw which indicates if the mandible was set on a flat surface it would have a shape similar to a rocking chair
Now many sources indicate that this is seen in Polynesians. But even this source shows that it is a characteristic shape of European females as well:
When a skull is tilted so the rear sits about 5-6cm higher, the jaw line of a Caucasoid skull would normally sit flat, whereas a Maori skull would sit off the surface both in front and the back...a true rocker jaw. But even so, European females have a slight rocker jaw compared to males. Confused? You should be.
Taken from http://tangatawhenua16.wixsite.com/the-first-ones-blog/single-post/2016/1/18/11-Jaw-Lines
European female skull
Notice the curve of spee, the long ramus, and overall tall form of the skull. Is this a lifestyle adaptation? Prenatal T effect?
Skull and Jaw Correction
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