Fossilization/ˌfɑːsələˈzeɪʃn/ Definition 1 of 3Pro Tip 1/3Time Passage Fossilization indicates a natural process taking millions of years, not a quick change. The fossilization of these dinosaur bones took eons. Pro Tip 2/3Natural Preserver Fossilization can preserve ancient life forms, maintaining their structure in rock. Incredible details can be preserved through fossilization. Pro Tip 3/3Scientific Importance This term is commonly used in paleontology, a science dealing with prehistoric life. Fossilization provides invaluable insights in paleontology.