Terry Cook has a collection of mammoth femurs that are fully mineral, along with tusks, and petrified wood, all from the same excavation in the former Parachini Ranch, along Hillcrest Avenue in Antioch.
Now all you need is a cache of fully intact, unmineralized dinosaur bones, and perhaps some unmineralized trilobites, and you'll have something.
Rapid mineralization isn't the problem. It's the total pattern.