There are many different ways a fossil can be formed. No matter what it has to do a lot with luck, one way is from the time of death until the discovery the body stays frozen. This is the best way to preserve it. Most things when they die are decomposed and recycled. The most common way is minerals fill the cellular spaces and crystallize. The shape of the original living organism is preserved in rock form.
I found the fossil of a Sinornithos from a 130-million year old forest that existed in what is now Liaoning Province, China.
This is a type of chineese bird lizard and it lived during the middle Jurassic period. It had feathers and is the closest dinosaur to a bird.
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