take something like a battleship, or any of the thousands of shipping cans lost at sea, or complete container ships, etc, that fall into sometimes anoxic enviroments, perhaps in subduction zones of the earths crust, where these massive objects, composed of countless bits, of the most durable materials made, will be incorporated into the earths crust, then to be bent, and folded, and eventualy thrust up into new land, and eroding out into the light after 50 million years.....works for dino bones...will work for other stuff