(a) A person is guilty of the unlawful possession or sale of gravestones when he possesses or sells, offers for sale or attempts to sell or transfers or disposes of any monument, gravestone or other structure placed or designed for a memorial of the dead, or any portion or fragment thereof, knowing that it has been unlawfully removed from a cemetery or burial ground.
(b) Unlawful possession or sale of gravestones is a class D felony.