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4meAndyou · F
Wood and bone disintegrate completely over time. (In the majority of instances). They create pockets of air when they disappear, and those pockets fill with stone that leaches in from the surrounding soil. Of course, you haven't researched any of that.
https://adventuredinosaurs.com/2021/08/28/dinosaur-fossils-with-skin/
https://adventuredinosaurs.com/2021/08/28/dinosaur-fossils-with-skin/