Bogs are another place where animal remains can be well preserved.A bog is a type of wetland where a large amount of dead plant matter accumulates.Footprints, flowers, even droppings; all of these things can be turned into fossils under the right conditions.
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How Fossils are Dated: Superposition, Carbon-14, and Radiometric Dating Imagine you've found a fossil in your backyard and you want to know how old it is. A long time ago scientists used the concept of superposition, which states that the oldest layer of sedimentary rock is found at the bottom of the strata, or layers, and the youngest at the top.
While they didn't have exact dates for how old these strata were, they could determine which fossils were older than others based on which layer they were found in.
So long as the temperature remains below freezing, the animal stays frozen, sort of like a natural freezer.
Paleontologists have found woolly mammoths perfectly preserved in permafrost.
Over time the soft parts of the animal decay, leaving only the harder parts like teeth and bones.