fossilized (Mentalist S01E17)

It's a worm. It's a fossilized worm.

fossilize

  [usually passive] to become or make sth become a fossil

  [v,vn] (disapproving) to become, or make sb/sth become, fixed and unable to change or develop

fossil

 the remains of an animal or a plant which have become hard and turned into rock

 (informal) (disapproving) an old person, especially one who is unable to accept new ideas or adapt to changes