3 adjectives to describe indent

There should be a distinct indent in the upper jaw, where the bone will eventually curve, whilst the lower jaw should show signs of curvature and protrude slightly in front of the upper jaw.

He walked forward, and by the moonlight traced the dusty indents of the wheels until they exchanged the sward for the hard road.

A great dock leaf, in which the chives have a strange resemblance to the arteries in the human frame, has small shallow indents all round it.

3 adjectives to describe  indent