fossilize

It took twenty million years to make the fish and to fossilize him so we'd have the evidence later.

When you stiffen up a way of life and try to fossilize it so it'll stay that way forever, then you find you've lost it.

In these fringing woods are some curious dripping crags which fossilize every article submitted to their influence.

Cartilaginous jaws would not fossilize, and the Ostracoderms may have possessed them.

And he was able to guess, although he could not move his limbs to test it, that he was in the form in which he was to fossilize.