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Dinosaur fossils have been preserved because they don't decompose quickly. Then, they were buried quickly by natural causes (IE, flash floods, etc), which protected them from the elements and further slowed the process of decomposition. Then, rain leaked through the soil, leaching out some of the minerals in the bone and replacing them with others. Eventually, the new minerals completely replaced the old ones, and pressure from the increasing amount of soil and rocks above compressed and hardened the fossils. The formed fossils were now protected because they were surrounded by the soil they had been buried in, which had now turned into stone, too.

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15y ago

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