What is frequent with these square jawed women, is the harmonious developement of the entire face. Bone growth was balanced. Cheekbones, jaw, chin, teeth, symmetry... it all grew well and wide.

Look at the amplitude of the smile of Mary Mastrantonio. These perfect theeth in the middle of this high quality face. It's an artwork from nature.

She has a long jaw with that feminine pointy A grade chin, and an B plus jaw angle.